Password only works when logging in
Today I installed Solus for the first time alongside Windows and have the following problem:
My password is only accepted when I log in to my user account. When I lock the screen, try to authenticate in a terminal (after calling a command with sudo) or try to authenticate graphically (e.g. for software updates) my password is rejected and the authentication fails.
I also checked that the keyboard layout has not changed and even wrote the password down in a text editor and pasted it instead of typing it. Nothing works. Does anybody have an idea what is going on or where I could look to pin down the error?
EDIT: Okay I did not check the keyboard layout in the login screen. It seems when I log out the keyboard layout changes back to the US layout (I use a german one) but it does NOT change back to the US layout when I just lock the screen.