Why Are My Assets Keep Moving Off Map?

Thank you for the reply. Sorry I had not informed you on that question. There are several areas, such as a ruin or my castle I am working on that will change to a different location (or get placed) on the map while in the editor. This seems to happen mostly during my build process or when I try to use the Hierarchical LOD feature in the Editor. After either one of the builds finish, I will notice that one of the places I have on my map will have been placed some where else rather than where i had it set at the first place. Last night I had the issue with my WHOLE castle moved UNDER the map a long way down. Talk about a pain to get it moved back in place from where I had it at first.