Last night I attempted to use the edit mode for the first time. Wanting to change a small portion, I erased around ten buildings and a couple dozen walls. All of these walls were level seven, only to return as level six once I decided that I didn't like the new design and exited the edit mode. 2 million isn't a big deal, I am simply bringing to light, if not already in the open, another possible issue with the edit system.
