You are playing with severely lopsided teams of your own. You have a 10* ruby Kunoichi paired with a platinum 6* Orbez. That’s a 14.5k power difference between your two heroes. The system sees this as sandbagging and is punishing you accordingly.
Now THIS is a problem. Less than a 2k power difference on your or your partner’s team, and only a few bars and 1* at most, yet you are facing teams over 3x your power (nearly 70k higher). This should never happen, no matter how few people are playing to potentially match you against. You literally have no way of winning, even with a team of your own that is twice as powerful.