If you disable javascript and try it then it does work. It looks like the JS you're using to pull in the reviews is causing the issue.
Not sure what the fix is off hand but you are using a very old library version of jQuery so you could try placing in an updated version instead which may solve the issue:
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
You could also try sticking this scroll to piece in, but I'm not confident this'll work if the default functionality isn't working for you.
<script type="text/javascript">
$(document).ready(function($) {
// Scroll to
$('a[href^="#"]').on('click', function(event) {
event.preventDefault();
var target = $(this.getAttribute('href'));
if( target.length ) {
event.preventDefault();
$('html, body').stop().animate({scrollTop: target.offset().top -150 }, 1000);
}
});
});
</script>
