Blank card with brackets

[rgw2]

On the main card sort, it is possible to drag a card between 2 spaces and it drops it onto the top card but places a blank card below with just brackets on it.

[Esselle]

Just had the same problem - easiest and quickest workaround is to go to line 44 on the htmlq.css stylesheet where it says 'margin-bottom: -1px', simply change the -1 to 1. Adds a very slight gap between the boxes and removes the problem of the statement fitting over two boxes. Hope that helps.