In that case I am happy to assist further.
The issue has to do with either a conflict with another plugin / theme / custom code on your site or settings.
This issue does not occur with WCPT normally – you can try setting up a default wordpress theme like Twenty Sixteen with just WooCommerce and WCPT in order to check.
However, this issue does get reported at times due to conflicts which are mostly trivial to resolve.
To assist you I need to duplicate the issue you are facing so I may debug it.
We can proceed with any of the following:
1. Create a duplicate of your site sans sensitive data and send me FTP and Admin credentials for the site.
2. I can setup a server for you and provide access so you may duplicate your site there.
3. You can send me the database and site files including theme and plugins and I will set it up at my end.
All three ways stated above allow me to view the issue at my end and work with it directly.
I am afraid it is not possible to debug the issue without actually having direct access to it.
If you choose to provide access, please reach me at: [email protected]