Menus not working accordingly after update

After updating word press it has only just come to light that my menus are not working correctly. I cannot create an account (Sign in/ Join) on my top menu, or complete payments after selecting a product and going through the cart process. furthermore, should i need to create an account to finish payment, this also does not work. My menu for the mobile view does not also load the side menu. I am using the oceanWP theme. I noticed that when I switch themes the functions work but obviously the site looks terrible.

Many thanks

Shimon

The page I need help with: [log in to see the link]