I always remap my keys because of using mouse with left hand and game won't remember it anymore. Worked 2 weeks ago, but now I have to remap the keys every time I open the game.

I always remap  the keys since I use the mouse with my left hand.  So I use jhkm for movement and I change a few other thing, This has worked fine for many years. I do it once for a new world or server and that's it, don't ever have to do it again. But lately, the last week or so, I have to remap the keys every time I log on. If I close the game, when I open it again I have to remap all my keys again .

What I expected to happen was...:
They keys will stay mapped like I want.

What actually happened was...:
They don't. I have to do it every time I open the game. This happens with no mods installed.