Number of stars are seen twice

This is happening because your theme has the following javacript:

var thsn_selectwrap = function () {
  jQuery('select:not(#rating)').each(function () {
    jQuery(this).wrap('<div class=\'thsn-select\'></div>')
  })
}

That javascript is run on your page after Site Reviews has initialized itself (i.e. has rendered the stars).

Then, after the theme’s javascript is run, Site Reviews refreshes itself and sees that the rating SELECT (dropdown) is no longer where it should be and so re-initializes the rating.

Since that javascript skips SELECTs with a #rating id, a workaround is to add that ID to the rating field with a PHP code snippet (you can use the Code Snippets plugin to add it):

add_filter('site-reviews/review-form/fields/normalized', function ($fields) {
    if (isset($fields['rating']->field['path']) && 'rating' === $fields['rating']->field['path']) {
        $fields['rating']->field['id'] = 'rating';
    }
    return $fields;
});

However, this also means that you can only have one rating form on the page at a time. It also will not work with the Review Forms add-on if using custom ratings.

Thanks. After I’ve implemented the snippet, everything works fine.

BR