title: loop_shop_columns filter not working properly (Woocommerce)
body: <p>Woocommerce Filter <strong>loop_shop_columns</strong> not working properly in Woocommerce version 2.6.1</p>
  
  <p>I am using the below code:</p>
  
  <pre><code>add_filter('loop_shop_columns', 'loop_columns');
  if (!function_exists('loop_columns')) {
  
      function loop_columns() {
      return 3; // 3 products per row
      }
  
  }
  </code></pre>