Yesterday my game somehow stopped saving the game in the character slot like it usually does. Whenever I start the game I can load up the newest save by clicking on "continue" or "show all saves" but when I want to save the game I have to save in a new savegame which doesn't get registered in the game. Another thing I noticed is that whenever I load up the newest save of that character I get the "Mods are activated" message from the game like I started a new game.  The mods I installed on t