Hey Sam,
Dor from the Loox Success team here 
Please note that while Loox is not yet an approved partner for the product ratings program, hundreds of merchants use Loox to manually upload their product ratings feed to Google and display their Loox reviews on Google Shopping.
Additionally, it seems the issue was occurring due to the fact that there were multiple product ratings feeds in your Google Merchant Center, which seems to have caused an issue with Google successfully “reading” them.
In any case, I’m happy that we were able to resolve this issue and you were able to integrate your Loox reviews with your Google Shopping product listings.
If any other issues come up, please feel free to reach out and our dedicated Support team will be happy to assist on the matter!