I believe yesterday or the day before yesterday it happened first: I've entered my username and password and got the message that the password is wrong. Entering it a second time worked (using Firefox and windows.
Since I copy & paste it I was kind of surprised. It might happen one time that I do not copy the string I wanted to copy but more than one time is awkward. Now I've looked myself in from my mobile phone and from my tablet (both Opera on Android). Each time I've entered the password very carefully and each time I got a "wrong password" at the first try while the second try did work.
Afterwards I've logged out from my laptops browser (PaleMoon=Firefox on Windows), logged in again and also got "wrong password" although the password field gets populated from the browsers password manager. Trying a second time works without problems.
Signing out now and signing in works on the first run. Maybe I'll have to log in from another device to recreate that? I bet if I try to login tomorrow at work I'll be seeing that error again. I'll report about that.