Comments form breacks the theme

After fighting a whole day with css in Acquia Marina, still I cannot have it behaving properly. But why is so unstable? I didn't have any strange requests. The only thing I want is to be able to see ratings and comments in the same page in a proper way, and as well let visitors and members make comments in the same page in a proper way. BUT it seems almost impossible to achieve. Any suggestions?

Cheers,