If a low-rep user makes an edit which needs to be approved, does it get bumped to front-page? I hardly ever visit main page (am on unix.SE), so I wouldn't have noticed.
Pending edits only get bumped up to the top page if they are approved, see How do suggested edits work? for more details.
In short suggested edit is approved when one of these happens:
- Author of the post approves
- Diamond moderator approves
- Two users with full edit privilege (usually 2K) approve
- One user with full edit privilege choose to Improve the edit and tick the "this edit was helpful"