Empty cart

Hello I have a particular issue. I am working on a WordPress website that uses Divi and Woocommerce.
It has a lot of custom code on it!
The problem comes when I add a product in the shopping cart and eventually click on the logo that takes to the home page then hovering on the cart icon it shows” No added products”, but the item number of the shopping shows that there is an added item, and when i click to open the cart the product table shows with all added products , it happens on Mozilla and Safari but not on Chrome!
When it comes to a mobile version it shows the same error on every mobile browser!
I am pretty sure it comes from the functions.php!

Can you please advise!

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