In battles with champions, girls' damage significantly (several times) decreased.
The first two pictures are from hentaiheroes.com. The second two are from the test server.
I specially pumped two legendary girls to the same level. At the same time, their damage is approximately two times different.
Unfortunately, only now I noticed that highlighting their level closed the stars. In fact, both have two. And the level of the hero is very close in both cases. So there is a clear mistake here.