Hi and welcome,
Sorry to see you here under the circumstances. So the issue does not occur when PRO is deactivated. What happens when you have both TEC and PRO active, but temporarily revert back to the default WP theme and deactivate all plugins besides TEC and PRO? What happens if you then deactivate PRO too, leaving only TEC and the default WP theme active?
Refer to our Themer’s Guide so we can identify the exact source of conflict. I checked our logged bugs and am not finding anything relating to your issue nor am I able to reproduce it on my test site.
Keep me posted and have a good evening! Cheers 🙂