Why do these not stack?

The two 30-day AA12's are from the same reward crate, so why don't they stack? I understand the one crated from ZM Weapon Pieces wouldn't stack with the Crate Reward one, but since the P90-Wildshot-Fatal Wasp and AWM-Longbill do stack from the same crate, I was wondering why these do not.

bwordBC.png

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