I give up you might actually be cursed. But honestly you say frnace even gives you bad winrates. I had a session like a week ago playing france 7.0 and had 15 wins in a row so I really fail to see how even that goes so badly for you.
I’m not a statistician but since teams usually aren’t single nation but many, a single game can count as a win for multiple nations, and a loss for multiple others. So it doesn’t have to add up.
There’s also other statistical anomalies, like “free for all” battles where the same nation is on both teams. Especially so with popular ones.