Another possibility is that both players resumed before the game was finished...

This is the second time the lobby crashed at the same time I win with the same player, could you explain me this? I have reported even that time and you have given the same explanation even that time, I could even make this third time too, until now I played two times with this astimus guy, and the very two times it resulted in a crash I guess this is not a co incidence. Let me prove it after a month or two, with the same result. Then you would understand.

Lobby crashes are rare but they may happen from time to time during our scheduled maintenance, e. g. when installing updates.

Good explanation, I will love to hear it more from you next time.

You shouldn't focus too much on rating, as it's not about winning or losing points. ELO actually helps finding players with the the same or similar skill like yourself.