Hi there,
I double checked the page that you gave us the link and it does not show the header. This might be something related to your environment or customization.
That is why I suggest that you take the steps below:
- Change from the Child Theme to Parent Theme and see if it fixes the issue
- Check for 3rd party plugin conflicts, by deactivating all plugins except Cornerstone and check if it fixes the issue. If yes then you need to activate the plugins one by one to find the one which is causing the
issue.
- Make sure that you purge all cache plugins that you might have and deactivate them during the test phase.
- Make sure that you use the compatible version of the Woocommerce plugin by checking the version compatibility article:
https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195
If you have still problems kindly get back to us with the information below using the Secure Note functionality of the post to follow up:
- WordPress Dashboard URL
- WordPress Dashboard User
- WordPress Dashboard Password
- Name of the Product Page that You See The Problem
Also, I wonder if this is happening on all Single Product Pages or not.
Thank you.