I have been having a very irritating experience for the past few days. I added too many maps to my project, because I was just checking various interior maps, resulting in my going over the map limit. So, I proceeded to delete some. Only every day, some randomly come back. My original map "pirate activity" was erased, and twice now it's come back as a blank map with nothing but a spawn point in it. I've saved numerous times since I deleted it, and I am certain it was gone (when I originally deleted it it wasn't just blank), but now it's back again. The same thing has happened with two other completely blank maps.