Why does some gear turn acount bound when put in chest

Some of my gear turn acount bound just by putted in the chest, is it a bug?

Where did you get the stuff?
All stuff dropped in the caches are account bound
All stuff modified become account bound

From the mercernary vendor in the den. I mean, same turn out fine and are tradeable but some become acount bound, its so strange

They drop from caches. Account bound

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