The star rating control is a SELECT element “under the hood”.
Can you confirm that the Site Reviews stylesheet and javascript files are being loaded on the page?
Site reviews uses the wp_footer hook to load the javascript file at the end of the page. If your theme is not using wp_footer() (as it should be), then this hook will not fire.
If they are, then your theme may be overriding the Site Reviews CSS.
What is the URL to the page?
I am having a similar issue with all of my sites. On the front end when leaving a review customers can select the stars by pointing at the stars and it looks like they are all selected (5 star rating) but if they don’t also select the rating in the drop down menu it throws an error that the field wasn’t completed when they submit the review.
@eshaver this is likely due to a conflict with your theme. Perhaps your theme has a script that adds custom styling to your Dropdown elements?
I can assist you further if you include the page URL to the review form on your website.
@eshaver I don’t see this. Which browser are you using? And is this on a desktop or mobile?

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This reply was modified 5 years, 2 months ago by
Gemini Labs.
Using Safari on phone. I did try my pc and that works fine. Sorry I didn’t think to do that earlier. Most of our reviewers will be using mobile devices though.
Thanks, I see the problem now. Will try to push an update by tomorrow to fix it.
@eshaver This should be fixed in v5.6.1
Please test and let me know, make sure to flush the cache after updating if you are using a caching plugin.