[CLIENT] Endscreen Buggie (Old Endscreen [kind of]??)

that happened to me and my friends on several patched about once every 100 games, the client is bugging out firstly with this endscreen, after that in the Champlist i can't unlock a champ, it says "?? RP/?? IP"

I heard this happened to several people on several client patches (my friend got this on the last build, i got it on the current one)