SHOP BUG, New Ancient coin item thingy

on 3v3 versus bots, playing soraka, trying to buy the raptor cloak, however the game wont let me combine my chain vest with the regen bead. I have the 250+ gold to combine but it wont let me. thanks g!

edit just recalled after 3 minutes of battle, and i was able to buy the ancient coin upgrade this time.*