Bases disappearing and saves being deleted

[Neil Kermstrong]

I really don't know what's going on with my savegame, the persistent and quicksave files keep deleting, I can only continue playing by getting a backup from the backup folder, and now I noticed my minmus outpost literally disappeared, it's no where to be seen. I had two kerbals in EVA just some meters from the base and it's suddenly gone.

I fear that this might also happen to my orbital station (and if it does I'll be really upset)

 

Now I'll just build a new outpost in the runway and cheat to teleport It to minmus, because I didn't notice the outpost was gone until lots of (quick) saves.