The texture of the sun has changed in my world.

How it happened:

I am building a house and I decided to create a copy of the savegame in the .minecraft folder. I cntrl-c and cntrl-v the savegame folder.

After that, i entered to play in one of the copies and changed my gamemode to creative. When I looked at the sky, the sun had the texture map of the enderman. Realizing I had a texture pack instaled, i unloaded it, but the enderman texture stayed.

After a while i went back to my original file and the sun was giant and popping, when I opened the menu, the sun texture changed to the attached image.

Now my worlds are stuck with silly sun textures.