Problem with my password

I had a similar situation, some time ago. Ended up losing my patience and reinstalling. But I’ve since read somewhere it can be caused by unmerged .pacnew files. Have you done any updates and nor merged thee .pacnew files?

You can check by installing meld:

pamac install meld

Followed by running:

sudo DIFFPROG=meld pacdiff

Also see:

And