Hello, sorry for the bad wording title but got no better one
reproduction: have 2 slottable Clothings and a slot item in your inventory, now if you click the slot item and right click the first clothing to check the % of slotting and then right click the % disappears, now if you try slotting in the second item (without putting the slot item in your inventory first) it also shows %, but when u right click/cancel it you cant put the slottable item back into your inventory, only drop it to the floor.