Thiefs Glove bugs with carousel pick + units upgrade

Hello , to be simple your Character got thiefs glove on him , you pick a Character into the Carousel with an item that gonna upgrade to the next tier your Character which got thief glove on him .

What happen is Thief Glove got Remove(go on bench) the item from Carousel go to your Character BUT 2 slot of Item are Black and lock you can't put anymore Item inside this slots , you can only combine the first slot and no more item ...

Hope you will be able to fix it .

Greetings , Gavinu .