Is there a glitch?

I was playing in the ongoing medley festival, and I have the "exp help" add on to boost my exp. I was about maybe 150exp away from level 70, but when I finished my 3 songs, the exp count would just keep going and going, until I finally exited out of the app. Now my level is at 92. Can you fix this? Thanks!

Black Eyed peas_forever about Love Live!School idol festival, v3.1.1