it could be a one of a few things or a combination of a few:
- shooter rod could be bent - but if you turned it while the ball is sitting the tip would move around
- the shooter housing has loosened and moved over and therefore mis-aligning
- the playfield may have moved over a little if lifted up and dropped back down with the locators over move to one side than the other and the gap comparison may be obvious as well - at a guess looks like the playfield is over to the rhs