Before installation, the data detected by the Google tool is "Product" only. After installation "Product" and "AggregateRating" are detected but the AggregateRating has an error as per the image attached. I believe the error is due to the preview badge. Can this issue be fixed?
It seems that you did not disable the microdata snippets though you don't use them so I can go ahead and disable the microdata snippets for you. The issues should be solved once our widgets' metafields have been fully updated, however, this may take up to 24 hours for this to happen if we have a long queue of requests.
After that, you can ask Google to recrawl your site and see if the issues are resolved. This can take a fair amount of time so if you want to speed up the process you can submit a direct request asking Google to recrawl it: https://support.google.com/webmasters/answer/6065812?hl=en
If any issue is existing on any non-product page, can you please send us the URL so we can inspect them further? We will take a closer look for you.