Well does the version you have on your phone match the market version? If not than Market is trying to update it but keeps failing. Market might have a partially downloaded copy that's corrupted. You can clear Market cache or trying uninstall, reinstall app to fix. Market also has issues with apps that are installed through other markets or side loaded (doesn't even have to be related to app that has the issue). Market isn't perfect, I've had the problem before that eventually took care of itself through ROM flashes.