I've had a little problem for a while that bugged me. When I get to my master assembly's drawing, the drawing keeps switching back and forth between high quality and draft quality. Everytime I open the file, the file reverts back to draft quality.

I read up on a few threads and figured that what is causing my problem is probably invalid edges/faces.This is the thread that made me figure this was my problem:

So I started giving it a go at fixing a bunch of these but I'm running in a little problem right now. I've got this part I'm trying to fix but the problem I'm encountering is that when I delete the problematic edges, more come up afterwards, nowhere near the ones I deleted.

When I use tools>check  it gives me these two edges:

So I figured I'd delete the faces and fill the discontinuities, but when I do that, this is what I get when I do tools>check after.

Why is that? Are there better ways to proceed to repair parts with invalid edges/faces?