Hi. For the most part my cart appears to be working fine, if I add something to the cart that's in stock, it adds no problem. If something is out of stock, it is correctly flagged as 'out of stock'. BUT, if there is something that is out of stock sitting in the basket when I add something new (that is sufficiently stocked), they are BOTH flagged as 'out of stock'. Adding additoinal items are all also incorrectly flagged as out of stock. If I clear all the items and add the stocked item again, it is added fine. I'm going crazy.

Running 1.3.9 and using 'stock by attributes' 1.4.12

Thanks in advance!