Why draw ?

lichess.org/SWwSY5yjMp2g
on the blackboard mat. why draw? and no rating?

Checkmate!

Same issue here: lichess.org/Xvea5w51FBYR

No clue, something wrong on lichess' end I think

Apparently the game is still going on even though white has been mated
Happened with me as well

just happened to me as well, see lichess.org/Itt86OzymAZ3

Oh boy, there are bugs indeed! I reopened the game and saw "your opponent left the game" and was able to claim victory/draw with checkmate already happened. Now it is checkmate AND timeout!

Same bug. I won with Checkmate and it's a draw with no Elo gain