Hello Paul,
you are welcome, thank you.
Troubleshooting didn't give any results even by entering the code (it was the only thing I hadn't tested).
On the server side I exclude it, because in both subdomains that we have sp page builder does not have the same problem.
Also, the newly created and saved page does not appear in the page list for a few minutes. Or it appears when setting ascending ID, but doesn't appear when setting descending ID (things like that).
I provided Ofi with the backend login details, I will paste them below as hidden text for you too.
Thank you again,
P.