Changes made on a page are not saving

Hello, the pages on my site are created with SiteOrigin Page Builder.
I haven’t made any changes for a long time, but now I need to add new pages to the site. I’m doing it as before: creating a new page, selecting a layout, and based on a previously created one, I’m trying to edit the content by replacing it with new data.

When I try to save, I refresh every time, but the page remains unchanged from the layout. What should I do?
WordPress version: 6.9.1
SiteOrigin Page Builder version: 2.34.0
I disabled all plugins to see if another plugin was affecting it — it didn’t help.
I cleared the entire site cache — it didn’t help.

Please advise how I can restore the proper creation of new pages on the site, as everything used to work and create correctly before.