Forge bug? Objects float away on their own.

Hello, I am working on something, and I am having a problem with an object (specifically a group of a wall, warthog, initial spawn point, and respawn point). When I place the object/group everything is fine. I then deselect it. If I reselect it, it will just start floating away. I’m not pressing anything. It doesn’t happen to anything else. When I deselect it, it stops moving.

After deleting it an trying again, the same thing occurs even if I lock the objects.

Furthermore, now when I reload the map, the warthog spawns where I created it, not where I moved it and saved the file.

Any ideas?