shop runeglaive bug

Was just playing ekko in a custom bot game when i purchased a sheen i ran around and kiled a few more enemies and was going to buy a lich bane and was suprised to see the runeglaive able to be bought

(didnt have smite)

i purchased it and the money for the build and my sheen vanished like it would when you would purchase it but i didnt get the runeglaive and i was unable to undo

i tried it again and it did the same thing