ultracade resolution problem on some games

[mebronx2000]

bought a brand new ultracade with a 33" cga monitor in it the game starts up, you can select a game, it goes into the instructions for the game controls but when it starts the main screen for the game itself, the screen is a bunch of moving partial horizontal lines.  This happens on some games, but not all.  I know that it happens with all of the Williams games like Defender, Joust, Mario Bros etc as well as the Golden Tee games. please help thanks