sometimes the dialogs feels off, like, they just talking nonsense or what?
Most of the translation is not bad but there's some areas where it's really off.
Like on page 9 Saikawa is actually asking "Is it really ok to be picking the relay anchors from the sports class? It's always been picked from the advanced class (where rui is at) to help them stand out!"
Mashiro then says his reason is that he feels bad for the advanced class because they're too slow and Mia responds saying there's some fast people in that class too (alluding to rui).
Page 11 then makes more sense since it is revealed Mashiro was too dumb to get into the advanced class. Also on page 15 Momoka was asking Saikawa if her oniichan did anything to him instead of the other way around.
Again most of the chapter is decently translated I think the group just needs a better TL checker.