I have made posts as review with the purpose for users to put scores. But the score system doesn't seem to be working. Only a grey bar appear when hovering over the column for scoring.
Completely disable all of your plugins, then re-download a new copy of the theme from ThemeForest and overwrite all of your current theme files on your server with a fresh copy and see if that fixes the issue. You won't lose any content or settings since those are stored in the database, but if you have made any changes directly to any of the theme code then you should make a backup of your current theme files so you don't lose your changes.