Yes, there's a problem with the 6-slot bags, which is on SOEs side of course. It all depends on the bag. Some bags, not just the ammo bag, will fit perfectly with 6-slots while certain others won't. Be thankful that bag adds a row as another problem with 6-slot bags is that certain bags don't add a row but cut rows off instead. Nothing like not being able to access the last 6 items or so in a 12 slot bag.
