Feedback system on Microjob V9 – Multiple feedback on same listing

Hi,

While testing the theme, I noticed that once a microjob has been bought and delivered, both users (seller and buyer) can leave more than one feedback on the same item from their work desk.
The “leave feedback” button is still shown and functional on their respective workdesk even a feedback was already left, thus allowing multiple feedback. (see attached pic)

Any suggestion on how to fix this?

Regards Pietro