diff --git a/src/__tests__/fixtures/price.samples.ts b/src/__tests__/fixtures/price.samples.ts
index 7866216..d1966b6 100644
--- a/src/__tests__/fixtures/price.samples.ts
+++ b/src/__tests__/fixtures/price.samples.ts
@@ -3552,3 +3552,180 @@ export const compositePriceCashbackCombinedWithComponentCashbacks: CompositePric
     ],
   },
 };
+
+export const unorderedPriceItemsOneTimeRecurrencesWithDiscount = [
+  {
+    description: 'Price 1 One time - no discount',
+    pricing_model: 'per_unit',
+    unit_amount: 10000000,
+    unit_amount_currency: 'EUR',
+    unit_amount_decimal: '100000',
+    is_tax_inclusive: true,
+    price_display_in_journeys: 'show_price',
+    active: true,
+    type: 'one_time',
+    billing_duration_unit: 'months',
+    notice_time_unit: 'months',
+    termination_time_unit: 'months',
+    renewal_duration_unit: 'months',
+    _tags: [],
+    _schema: 'price',
+    _id: '2f922147-f3eb-46d6-8ef0-ce35a8542466',
+    _org: '739224',
+    _owners: [
+      {
+        org_id: '739224',
+        user_id: '10009151',
+      },
+    ],
+    _created_at: '2025-11-26T13:37:10.419Z',
+    _updated_at: '2025-11-26T13:37:10.419Z',
+    internal_description: 'Price 1 One time - no discount',
+    billing_period: 'weekly',
+    _title: 'Price 1 One time - no discount',
+    _viewers: {},
+    _messages: {},
+    _coupons: [],
+    blockMappingData: {},
+    quantity: 1,
+  },
+  {
+    description: 'Price 2 One time - with discount',
+    pricing_model: 'per_unit',
+    unit_amount: 1000000,
+    unit_amount_currency: 'EUR',
+    unit_amount_decimal: '10000',
+    is_tax_inclusive: true,
+    price_display_in_journeys: 'show_price',
+    active: true,
+    type: 'one_time',
+    billing_duration_unit: 'months',
+    notice_time_unit: 'months',
+    termination_time_unit: 'months',
+    renewal_duration_unit: 'months',
+    _tags: [],
+    _schema: 'price',
+    _id: '4d5b79c9-a3b6-45d7-b078-1b78dd9f4b9e',
+    _org: '739224',
+    _created_at: '2025-11-26T13:38:22.953Z',
+    _updated_at: '2025-11-26T13:38:22.953Z',
+    internal_description: 'Price 2 One time - with discount',
+    billing_period: 'weekly',
+    _title: 'Price 2 One time - with discount',
+    _viewers: {},
+    _messages: {},
+    _coupons: [
+      {
+        name: 'PROMO 20',
+        type: 'percentage',
+        fixed_value: 0,
+        fixed_value_currency: 'EUR',
+        fixed_value_decimal: '0.00',
+        category: 'discount',
+        active: true,
+        prices: [
+          {
+            description: 'Price Issue 2 (PROMO)',
+            pricing_model: 'per_unit',
+            unit_amount: 1000000,
+            unit_amount_currency: 'EUR',
+            unit_amount_decimal: '10000',
+            is_tax_inclusive: true,
+            price_display_in_journeys: 'show_price',
+            active: true,
+            type: 'one_time',
+            billing_duration_unit: 'months',
+            notice_time_unit: 'months',
+            termination_time_unit: 'months',
+            renewal_duration_unit: 'months',
+            _tags: [],
+            _schema: 'price',
+            _id: '4d5b79c9-a3b6-45d7-b078-1b78dd9f4b9e',
+            _org: '739224',
+            _owners: [
+              {
+                org_id: '739224',
+                user_id: '10009151',
+              },
+            ],
+            _created_at: '2025-11-26T13:38:22.953Z',
+            _updated_at: '2025-11-26T13:38:22.953Z',
+            internal_description: 'Price Issue 2 (PROMO)',
+            billing_period: 'weekly',
+            _title: 'Price Issue 2 (PROMO)',
+            _acl: {
+              view: ['org_739224'],
+              edit: ['org_739224'],
+              delete: ['org_739224'],
+            },
+            $relation: {
+              entity_id: '4d5b79c9-a3b6-45d7-b078-1b78dd9f4b9e',
+              _schema: 'price',
+              _tags: [],
+            },
+          },
+        ],
+        _schema: 'coupon',
+        percentage_value: '20',
+        _id: 'bd801823-e4d2-47cb-bdfa-58e40392055f',
+        _org: '739224',
+        _owners: [
+          {
+            org_id: '739224',
+            user_id: '10009151',
+          },
+        ],
+        _created_at: '2025-11-26T13:39:37.146Z',
+        _updated_at: '2025-11-26T13:39:37.146Z',
+        cashback_period: '0',
+        _title: 'PROMO 20',
+        _acl: {
+          view: ['org_739224'],
+          edit: ['org_739224'],
+          delete: ['org_739224'],
+        },
+        _relations: [
+          {
+            entity_id: '4d5b79c9-a3b6-45d7-b078-1b78dd9f4b9e',
+            _acl: {
+              view: ['org_739224'],
+              edit: ['org_739224'],
+              delete: ['org_739224'],
+            },
+          },
+        ],
+        _viewers: {},
+        _messages: {},
+      },
+    ],
+    blockMappingData: {},
+    quantity: 1,
+  },
+  {
+    description: 'Price 3 One time - no discount',
+    pricing_model: 'per_unit',
+    unit_amount: 100000,
+    unit_amount_currency: 'EUR',
+    unit_amount_decimal: '1000',
+    is_tax_inclusive: true,
+    price_display_in_journeys: 'show_price',
+    active: true,
+    type: 'one_time',
+    billing_duration_unit: 'months',
+    notice_time_unit: 'months',
+    termination_time_unit: 'months',
+    renewal_duration_unit: 'months',
+    _tags: [],
+    _schema: 'price',
+    _id: '5d3f3968-6e94-4934-b282-517d990d62e2',
+    _org: '739224',
+    _created_at: '2025-11-26T13:39:11.980Z',
+    _updated_at: '2025-11-26T13:39:11.980Z',
+    internal_description: 'Price 3 One time - no discount',
+    billing_period: 'weekly',
+    _title: 'Price 3 One time - no discount',
+    _coupons: [],
+    blockMappingData: {},
+    quantity: 1,
+  },
+] as PriceItemDto[];
diff --git a/src/computations/compute-totals.test.ts b/src/computations/compute-totals.test.ts
index 66ce8f8..ffe7a8a 100644
--- a/src/computations/compute-totals.test.ts
+++ b/src/computations/compute-totals.test.ts
@@ -816,6 +816,17 @@ describe('computeAggregatedAndPriceTotals', () => {
       );
       expect(result).toEqual(results.computedCompositePriceWithComponentsWithPromoCodeRequiredCoupon);
     });
+    it('should compute the pricing total breakdown details with discounts correctly independently of the order of the items', () => {
+      const result = computeAggregatedAndPriceTotals(samples.unorderedPriceItemsOneTimeRecurrencesWithDiscount, {
+        redeemedPromos: [],
+      });
+      expect(result.total_details?.breakdown?.recurrences?.[0]?.amount_total_decimal).toEqual('109000');
+      expect(result.total_details?.breakdown?.recurrences?.[0]?.amount_total).toEqual(10900000);
+      expect(result.total_details?.breakdown?.recurrences?.[0]?.before_discount_amount_total_decimal).toEqual('111000');
+      expect(result.total_details?.breakdown?.recurrences?.[0]?.before_discount_amount_total).toEqual(11100000);
+      expect(result.total_details?.breakdown?.recurrences?.[0]?.discount_amount_decimal).toEqual('2000');
+      expect(result.total_details?.breakdown?.recurrences?.[0]?.discount_amount).toEqual(200000);
+    });
   });
 
   it('computes the pricing details for a simple price', () => {
diff --git a/src/computations/compute-totals.ts b/src/computations/compute-totals.ts
index 11fa9c5..bf23117 100644
--- a/src/computations/compute-totals.ts
+++ b/src/computations/compute-totals.ts
@@ -282,9 +282,13 @@ const recomputeDetailTotals = (
       typeof recurrence.discount_amount !== 'undefined' ? toDineroFromInteger(recurrence.discount_amount) : undefined;
 
     if (priceBeforeDiscountAmountTotal || existingRecurrenceBeforeDiscountAmountTotal) {
+      // If recurrence doesn't have before_discount_amount_total yet, initialize it with current total (before adding this item)
+      const initializedExistingTotal =
+        existingRecurrenceBeforeDiscountAmountTotal ??
+        toDineroFromInteger(recurrence.amount_total).subtract(priceTotal);
+
       const baseAmount = priceBeforeDiscountAmountTotal || priceTotal;
-      const recurrenceBeforeDiscountAmountTotal =
-        existingRecurrenceBeforeDiscountAmountTotal?.add(baseAmount) ?? baseAmount;
+      const recurrenceBeforeDiscountAmountTotal = initializedExistingTotal.add(baseAmount);
       recurrence.before_discount_amount_total = recurrenceBeforeDiscountAmountTotal.getAmount();
       recurrence.before_discount_amount_total_decimal = recurrenceBeforeDiscountAmountTotal.toUnit().toString();
     }