Cheat or Bug ?

During my last blitz game, I wasn't able to play ; I mean I only could anticipate. Yet I lost because of time since the last move of my opponent was done twice so no new move from him but I was expected to play even though I couldn't.

Your opponent has 3 wins and 16 losses in his games, so if he's cheating, he's not very good at it. I would imagine that it was just a bug on your end, as I see nothing suspicious about the game. Try refreshing the page if it happens again?