Game's Online modes issue

Hello,
I just bought the game on Steam, but I can't play online modes.

In offline mode, it's ok and no delay or lag.

My ping is 66 ms, and it's working fine in all other online games, and no lag.

Explain:
The game’s online modes have become unplayable. Whenever I join a match, everything is normal for about 5 seconds, and then the input delay suddenly becomes massive, making it impossible to play. 

Thanks,