Well, this sucks.

[FrugFrug]

For some reason part of my map gets reset everytime I re-enter it to edit.

Only happens to terrain, it doesn't reset objects.

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Any way to fix this? If not, I'll have to redesign a portion of my map 

[Mustikki]

Never heard of such issue.
Maybe you changed the map size and now it keeps resetting everything that cross certain point?
Try to make a new terrain (much bigger) with sp terrain editor and copy objects to it.

[FrugFrug]

Nevermind.

[FrugFrug]

blah

[FrugFrug]

Here is exactly what I do when I try to Transfer my objects/terrain to a new Scene: (If I'm doing something wrong, please tell me.)

Copy long code of numbers from scn_my_scene_16.

Go into singleplayer terrain editor.

Make the map longer.

Paste the new code onto scn_my_scene_17 (or 18, 19, 20.)

Add the same outer terrain. (If I go into the game now I can freely edit terrain anywhere on the map.)

Copy the file inside the folder "SceneObj" named "scn_my_scene_16.sco" and then rename the copy "scn_my_scene_17.sco" (After I add this though, I cannot edit the terrain past the same point, more pictures showing the same line:

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Am I doing something wrong, or is the Object file bugged or something? 

[Ozin]

I think this is because you edited the terrain. I'm not sure how terrain editing after generating works, but I think there must be some kind of heightmap with a certain resolution saved to the scene file, and I don't think the resolution of this can be changed.
So when you generate a new terrain, and use an old scene file, the resolutions won't match. This is all guesswork though. Maybe cmp knows

[Airith]

I've had this happen before FrugFrug, could never fix it. Something in the .sco file is corrupted I think. You can try covering it up, but I suggest restarting, even if that sucks.