Hello,

In most cases updating Woocommerce and our theme does not cause any problems. Your site works incorrectly https://gyazo.com/f82dc0ee4ab20c8685c10e7ec2689fa4 It may be due to plugins or your customizations.

In order to view if there is an HTML code I need to switch to text mode and I cannot.

Try to deactivate all the plugins and remove your customization code.

Best Regards