Thief's gloves bug

So I was playing a predator game with Thief's gloves on a 2 star Skarner. During the third item round, I got another Skarner with an armor and didn't sell it to level up Skarner as fast as possible. I played some rounds with my TG Skarner, until I got the ones I was lacking to level him up. This is where the bug happened : instead of dropping the armor, the Skarner on my bench just merged with the others, leaving me with a 3 star Skarner with Thief's gloves stats, Thief's gloves items AND Chain vest stats. I couldn't use it to create another item, it never appeared on my bench and it "erased" the Thief's gloves slot, creating a visual bug.