Hi Lorenzo,

This is the default behavior from WooCommerce. When having only one variation, the price was displayed on the main price, so it wasn't shown under variations anymore:

Please add the custom code below to fix it. (How to add custom code? ↗):

add_action( 'wp_footer', function () {
	?>
    <script type="text/javascript">
      (function($) {
        $(document).on('found_variation', function(e, t) {
          if ($(e['target']).find('.single_variation .woocommerce-variation-price').text() === '') {
            $(e['target']).find('.single_variation .woocommerce-variation-price').
                html($(e['target']).find('.woovr-variation-active').data('pricehtml'));
          }
        });
      })(jQuery);
    </script>
	<?php
}, 99 );