What's wrong with lichess clock?

I got independent clock that after the game was finished it showed 9:45. My lichess clock run out of time shows 00:00, which equals 5 minutes I spend playing the game. My opponent clock shows 2:56. It doesn't add up. Where why and how my opponent getting this extra time.

because of maintence of the website

And lag compensation.

This happens often. I think some monkey business going on. I will find out one way or another.

Tactics are messing up bad...what is wrong?