Toufiq, this is a persistent error that many users write and report as an error in the forum and on internet support sites, it is an error of the SP Page Builder with some condition in the servers. Let me explain: it was working very well for me and suddenly it stopped working well, look at all the pages there are. I have to deliver the site to my client, that is why I have already made another installation from scratch of another Joomla on my personal server and it is working well in this installation.
I no longer need this server, (I copied the SSH and Joomla accesses). If you want you can use this server as a laboratory to find the error, you can make all the checks and changes you require with the operating system, php, joomla or SP Page Builder, in order to find what makes this error occur and can solve the many tickets you have on this subject in which the SP Page Builder saves, but the re-editing shows an old version as if it were cache.
I look forward to your response.
Hugo