Magento 2 Menu and Checkout Cart not showing

Website top menu and checkout options only show intermittently, they appear to show more often on this page than on others.

https://www.theaquaticshut.co.uk/aquaforest-component-pro-123.html

Folder permissions and ownership have been checked and confirmed but could have been missed.

Were working perfectly for months until very recently. A new checkout addon was installed but still worked fine for two weeks, have since removed the addon and it has still not returned to normal.

A couple of JavaScript errors do show (sometimes) but I am unsure if these are the issue or not.