Area 51 site 4 help

[Thebax]

Hey guys. I'm new to arcade machines and just got my first ones. I just bought a 33" showcase with no game, nba jam, crime city cabinet, and an Area 51 site 4. When playing Area 51 the game starts to stretch and eventually the bottom of the game goes off the screen and the top curls over. The monitor is a makavisoin. Any one have any ideas of what it could be? I am thinking may be a cap that handles the verticle. Anyone know where I can get the cap layouts for a makavision monitor chassis? Any advise is appreciated.