I am using this plugin: https://wordpress.org/plugins/siteorigin-panels/
I then create and publish content on any page using the SiteOrigin plugin.
I leave the editor panel and view the page.
Then later when I try to edit the page that I created with SiteOrigin, the content does not come in correctly. In fact I can’t see it at all. If I click update in the editor it overwrites the content and it is all gone.
If I turn off the Background Music Lite Pro plugin SiteOrigin works.
This plugin hasn’t been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress. you can use this plugin https://wordpress.org/plugins/soundy-background-music/ or https://wordpress.org/plugins/wp-music/