In the latest hotfix there was something to fix the issue where stacks of ammo show the incorrect amount or items appearing Pristine even when they're not.
This did not resolve the issue of mags from other players appearing full and having "ghost bullets" when trying to be shot. This also happens in guns without magazines at all like the revolver. It's frustrating that every mag from a player has to be double-checked otherwise you risk just dying because you're shooting non-existant bullets.