I have had seen similar issues on mine. Basically my plunger isn't centered to the ball. Check that visually first. I noticed I had a bit of slop between the playfield and the sides of the cabinet. Pushing the playfield to one side to help center it basically confirmed the issue.
I unfortunately didn't find a pure fix yet for mine. I just re-adjusted my shooter rod tonight as yzfguy described. But check out those things first.