When creating pages and various posts in Wordpress, instead of content, it displays content from other pages, how to decide?

Question

Content

When creating new pages, posts or products, if you enter content, it is not displayed on the created page; instead, wordpress substitutes content from other previously created and completed pages of the site. I use page builder Siteorigin.
When the plugin is disabled, the content works fine. Tried reinstalling with no result.