[HaisenbergNotDead]

I found that the problem is all about not registering/removing players from ranking table either SQlite or MySQL, no difference. In that case players can check other players by using "top" and "players" commands but nothing happens when they type "rank" and "session" as they are missing in tables. I still don't understand why it removes players from database on the next round they first play on the server and it happens even on usual arena maps like "arena_well" and etc.