Hey, this is the Deluxe version, is has morphing asteroids....
"It's a feature not a bug" as one of Atari's presidents once used to say....
Just kidding of course. This is definitely no monitor issue. The link that fever provided should help you a lot !
Start with running the self-test mode, my bet is on a bad RAM (just like my SW

)
I love that little video, that sounds, the picture.......man Asteroids is so in the top of my list....
