Most likely because you were cheating, or at least playing so suspiciously that the automated systems thought you were cheating. What were you doing that game?
We must have a certain degree of mercy for those cheaters. Without their engines they probably wouldn't even know how to tie their shoes.
At the time the question was posted I didn't see any mark on their open account. Today their account is closed.
On Lichess if a player either intentionally or accidentally opens an analysis board with an engine while playing, even if it is an accident Lichess declares "cheat detected" and ends the game. I do not know whether Lishogi functions the same way.
You can't post in the forums yet. Play some games!