Please don't use the rating for non-singular (archive) pages. It's not finished yet. wpDiscuz 7 doesn't support it yet. We'll fix all CSS and add it in next Beta-9 version.
@tomson, yes. In page settings, there is a setting "Enable comments". The bug happens, if comments are disabled.
This is not a bug.
Do you know that the rating shortcode is only based on the Rating Custom field in comment forms? So if you disable the comments, how do you expect the rating should be made? What is the mean to show rating if there is no way to rate for that rating? This is a logical issue not a bug. You should not use the shortcode if you've disabled the comments, because that rating is based on the rating field of comment form.