In game, Kayn has some really bad gold desync or something. I can't buy items even when I have the gold, and when I don't have the gold, the icons are lit up like I do have enough gold. I have to sell and unsell items several times to sometimes be able to clear the bug, or I just have to buy what items I can before leaving base. Youmuu's has experienced the bug in his pbe kayn video i linked too at 8:00, though not as bad as I have seen it. Also, the predator boots appear as an empty square.