The minicart in the header does not update the number of items after I put some product in it unless I refresh the page. It happen when I use Header Builder plugin come with theme.
I can see that you do not have the newest version of Betheme.
Please, update it, and check if the problem persists.
I updated to the newest version but the problem still exist.
Please, go to WooCommerce -> Settings -> Products, and disable the AJAX option.
If even after that, the cart will not update, please send us WordPress dashboard access privately thru the contact form, which is on the right side at http://themeforest.net/user/muffingroup#contact, and we will check what might be the reason.
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I turn off AJAX and it work correctly. Thanks for your support