I work in online marketing for customers and therefore work with many different themes.
Yours is the best in looks and has many features too.
Nevertheless, we rarely buy your theme because it causes the most problems.
Example: We bought about 10 licenses from you. for others well over 100. For me it is unnecessary time to constantly search for errors. You are right, of course there can be conflicts in interaction with your theme and a plugin. There are themes where I haven’t had a conflict in 5 years.
That’s just a side note. As I said, your theme looks great and has many great features.
However, the problems with your theme are not that common anymore. So overall you are on the right track.
I have the suspicion that the function of reducing the size of images from WP Optimize in combination with your theme feature leads to the conflict.
You are welcome to look.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.