Terrain Editor Doing something Funny

Hello, I’m currently making a terrain and the terrain editor is starting to do strange things, as well as weird errors are coming up that, are seemingly not messing with anything, but still strange.

I was zoomed out quite far for a bit viewing form the Y axis to make it. Looked fine, etc. etc. However, when I saved the file and made a build of it, when I switched back into Unity, this is what I saw:

Screen Shot

It’s very strange as I can’t work on it anymore because I can’t see anything from as far as i had it before - not NEAAAARLY the amount of edges are rendering anymore.

What’s it doing?

Did you resize it AFTER you finished working on it?
Because that causes some issues some times.