I keep losing items in my warband bank - I mainly use it for crafting materials. Today I did some crafting on my alts and suddenly all my Apprentice’s Crafting Licenses were gone.. Had nearly 200 of them.
I think possibly it happens when you use the item for an NPC crafting order.. It was certainly the only thing I used it for.. Like it uses the entire stack instead of the number required for the recipe.
It also doesn’t happen with all items. For some reason Bismuth Rank II keeps disappearing from my bank as well.
This is quite annoying as I’ve been stacking all my crafting materials to AVOID having to buy everything on the AH.