how on earth can someone manipulate the clock in chess.com

So Recently I encountered so many players more than 50 accounts using the clock manipulation cheat. My connection was really good, but somehow the game froze at a time when my opponents left only seconds - 20 seconds and I still had 33 seconds to . Then suddenly the time counter went to 0. 

https://support.chess.com/en/articles/8615369-what-is-lag-forgiveness-why-did-the-clocks-suddenly-change

thank you for the article

can the difference between one player up to 2 minutes? because when my opponents were in seconds and my time was at , suddenly it just drop to 0?

Your time was at _____ ? (what? 2 minutes?)

That would be very unusual. I have never seen it myself. Perhaps you got disconnected.

Please provide a link to that game.

That indicates you for disconnected. The server keeps the official clocks and no one can manipulate them.

are you sure about that? because when it says i am disconnected, i can actually at that moment accessed youtube