I started working on a level today. It's full of things and stuff that make good levels and when I go to my pod the regular save level pop-up appeared. When I press the save button another pop-up appears when I'm in my pod. I clicked save on it and now when I go back into the level, it's empty. Not the regular blank level, the background is gone, the blank level floor is gone, the spawns, and even the name of the level was changed into unnamed level. I spawned in a level with a bluish-brown background and a weird red and black thing in the distance.
I have no idea how this happened and it never happened to me before today.
(Note: I was on my moon)