Cart icon showing 0 on wpengine

Hi,

I migrated a site to wpengine, and the cart icon is showing 0 instead of the amount, although there are items in it.
https://moresscharms.wpengine.com/

wpengine said there may be an argument or a cookie that needs to be disabled from caching, and you may be able to help with telling us what they are.

If the entire site is not cached then it is working.

Please see if you can help,

Thanks,
Omer