Can't add more than one product to cart in safari (SOLVED)

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.5
-- PHP version -- : 7.0.17
-- Browser(s) name and version -- : Safari

In any other browser this works fine, but in Safari when adding more than one product to the cart, the other product is gone. After checkout the other product is back in the cart again resulting in the customers having to pay double shipping costs.

Any help would be very much appreciated.

For the record, I can't update to Hikashop 3 because if I do so my shop has many errors and I haven't been able to figure them all out so I reinstalled 2.6.

In case anyone else has this problem. It is kind of unique. I have a product slideshow on different pages, they all link to http://domain. But I have recently installed a SSL EV certificate, so it is a forced SSL connection. Safari has the error that if the link is http and not https the product gets added to the cart, but replaces the previous added product.

I have altered the links all to https and voila the error is gone and everything works fine in Safari.

This is for anyone who is an idiot like I am and doesn't see this right away.