How to call this bug?

Hi people, I am Zach Winter (Zack Winter) I created this account because I got 1 day suspension for getting disconnected, reconnect to the game because the game keeps crashing and it's so laggy. So I created another account. played V.S A.I and then found this bug. I was already in an existing game but then some stats showed up from the last game and I clicked home. I though I had seriously left the game but then when I clicked play, Beginner. It didn't let me play and this showed up :