not most of the players have this issue but it's a bit common, when playing with someone, like ur brother/sister, for example, play with u in a ranked match, u and ur brother/sister use the Same google account with the same IP and same wifi, and that won't do any SP change at all, it's like ur playing with alts and the bot will count it as farming and you would really get banned.
there should be an option for sp change with different accounts at least, even with the same IP, ur brother/sister won't be able to rate ur maps or play ranked for SP change with u just because u use the same IP, without even knowing about that, so I hope if someone knows more about this issue especially eric gurt can respond at least :/
and i dont think we can solve this problem
hope u understand.