It’s because you’re echoing a function that itself echoes a value. The function has a display parameter that you have to set to false if you want it to return it’s value to use it that way:
function the_ratings($start_tag = 'div', $custom_id = 0, $display = true)
Also –
if($category->cat_ID = 4)
should be:
if($category->cat_ID == 4)
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