It is showing dropdown along with star rating.

I have sorted it by using this code

/* Hide the dropdown rating on the reviews page */ body.page-id-123 .jq-selectbox__select { display: none !important; }

The problem is happening because your theme uses https://dimox.name/jquery-form-styler/ to add custom styling to form elements. The jq-selectbox__select div is created by that javascript library.