Password

If I log in to my Macbook, using my password, it works and I get in. But now I'm trying to update to macos27 and it asks me for my password again, and it doesn't work. I'm sure I typed it in correctly. I tried changing my password in settings, and to log in to these settings acces is denied again.. Touch ID works, logging in works too. How to fix this? Anyone else has the same problem?