TERRAIN MODEL EDITS NOT HELD

I have a Terrain Model created from multiple Fieldbooks and appended using the "Create Complex".

I've managed to delete all the pieces of DTM's from each day, and have the one final DTM.

I have made several edits, like deleting triangles along the edge and adding some features.

I played with the Contour interval to locate rod busts.

Certain editing commands, or maybe toggling on and off triangles have caused my edits to revert.

I have no more Fieldbooks, they have been "STRIPED", yet my edits are not always being held.

Why? 

Should I export to Land XML and re-import, then work on this surface?

I have toggled the "de-activate rules" back and forth to see if this is the problem.

Are my edits becoming "rules".

I can't find any video or help on this problem.