I showed you the video, they are not empty in the 3rd version, you saw how the content is gone on refresh.
Also you can see the content is present in the database, just check it. Where would the database content come from if the modules where empty from the start?
In your video you are making the update to the 5th version (at this point the modules become empty) and then add the 3rd version again, so of course the modules remain empty. Just install the akeeba I sent you (with sp page builder 3) and check all modules, you will see they all have content.
If you want to deny there is an issue with this, fine, let's pretend everything is working great, but don't tell me the modules are empty from the start, I have been making hundreds of websites with Sp Page Builder, I think I would know if a module is empty or not. Especially when you can visually see how the modules dissapear on refresh.