Certain items don't want to cooperate with inventory readers

[StaticPH]

I haven't figured out what the pattern is for causing this, but certain items cannot be removed from inventories via the inventory reader, and instead create a ghost item in the player's inventory with stack size zero. All I've been able to confirm as far as the pattern is that I haven't been able to cause this to occur with items that would normally stack, but it doesn't seem to occur with all items that don't stack.