@Tong-Bi-Thu
Hi there,
As to why your topic gets closed: the Support Forum is for asking questions and to point out bugs. That you lose more often is not a bug and we already gave an answer to your question. If you want to see how other managers think about this, then create a topic on OSM: The Game. That forum is meant for discussions.
I don't know why a small increase would be such a bad thing that it needs fixed or why you are blaming the game's algoritmes for it. They are far too complex to just say: you have more ball possesion, chances and shots on goal, so you win the match.
Perhaps your opponents are starting to use different tactics that work better against your own tactics. If you feel that you are starting to lose too much with those tactics, then try to come up with something else and see if you can get that percentage lower again.