Predator Rune Bugged

Predator Rune on Kayn atm once I got red smite I couldn't go into a warrior. then I tried buying dusk blade it didn't work eithier so I was stuck in a rank match where all the items I could even buy was boots, and only the Parts to make the last item, I had the gold, my internet service is greatt 100mbps upload 100 mbps download. It just was upsetting that it happened during a rank game (even though its pre-season just trying to pick up my mmr to d1)