It looks like you already have a review functionality on your website, I assume this is built-in the Theme you are using?! If so, you must turn this functionality off.
Please, provide a link to one of your reviews where I can see the WP Reviews plugin enabled so I can see the issue.
Also, I am not sure what you mean by “I have all plugins installed”, the best way to make things work is to have only one plugin activate on your website.
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