[CLIENT] Didn't get promoted?

Hey Rito, I just finished my last game in a promotion series from silver 4 to silver 3 (I know, not very impressive). But after finishing my series with a score of 2W-1L and getting the happy little congratulations message, I went to my leagues board and noticed I was still in silver 4? I'm also back in my series without playing any games since. I don't know how to recreate this bug, as this is the first time it's happened to me and there's lots of variables that could have caused it to happen. What I can tell you is that I finished my first two games in my series last night, one win followed by a loss. I then decided to wait until today to try my last match, which I thankfully won. Any help helps. If this is posted in the wrong place, please inform me where to take this! (First time reporting a bug so I don't know if I'm doing this right)