Mobile version of sonic 2 has a glitch?

Ok, so I downloaded sonic 2 on my lg rumor touch (virgin mobile plan) and the game was pretty fun. Levels ran smooth, it was fine.

I get to act one of the mystic cave zone, and complete it all the way up to the eggman sign, but then the sign won't turn.

The sign is like halfway accross the screen, and the screen won't move.

Has this happened to anyone else?