Pfthb

I have a local webshop with woocommerce and flatsome-child theme. I've created a mini-cart in header that works fine and added an ajax code to make it update.

Ajax code:

add_filter( 'woocommerce_add_to_cart_fragments', 'flatsome_add_to_cart_dropdown', 30, 1 );
function flatsome_add_to_cart_dropdown( $fragments ) 
 global $woocommerce;
 global $flatsome_opt;
 ob_start();
 ?>
 <div class="cart-inner">
 <a href="<?php echo esc_url( $woocommerce->cart->get_cart_url() ); ?>" class="cart-link">
 <strong class="cart-name hide-for-small"><?php _e('Cart', 'woocommerce'); ?></strong> 
 <span class="cart-price hide-for-small">/ <?php wc_cart_totals_order_total_html(); ?></span>
 <!-- cart icon -->
 <div class="cart-icon">
 <?php if ($flatsome_opt['custom_cart_icon']) ?> 
 <div class="custom-cart-inner">
 <div class="custom-cart-count"><?php echo $woocommerce->cart->cart_contents_count; ?></div>
 <img class="custom-cart-icon" alt="<?php _e('Cart', 'woocommerce'); ?>" src="<?php echo $flatsome_opt['custom_cart_icon']?>"/> 
 </div><!-- .custom-cart-inner -->
 <?php else ?> 
 <strong><?php echo $woocommerce->cart->cart_contents_count; ?></strong> 
 <span class="cart-icon-handle"></span>
 <?php ?>
 </div><!-- end cart icon -->
 </a>
 <div class="nav-dropdown">
 <div id="mini-cart-content" class="nav-dropdown-inner widget_shopping_cart widget_shopping_cart_content">
 <?php 
 if (sizeof($woocommerce->cart->cart_contents)>0) 
 echo woocommerce_mini_cart();
 else 
 echo '<p class="empty">'.__('No products in the cart.','woocommerce').'</p>';
 
 ?> 
 </div><!-- .nav-dropdown-inner -->
 </div><!-- .nav-dropdown -->
 </div><!-- .cart-inner -->

 <?php
 $fragments['.cart-inner'] = ob_get_clean();
 return $fragments;

My actual header mini cart looks the same in body. The problem I'm facing is that all of this works fine but only on second change. So for example when you change quantity of the product to 15 the main cart updates but the mini cart stays unchanged. And if you then change the quantity again to 50 then both mini cart and main cart get updated. And then again if you change nothing happens but the second time it works. Could this be a cache issue, I've already tried disabling plugins but nothing seems to work. Anyone encountered something like this?

Note: the quantity change and count is custom made by a plugin , so could this cause the problem?