Hey together,
today I had the same problem and found the solution for this issue.
When moving from development to production you usually take your database-script and replace all strings with your development-url to the strings of your production-url (e.g. http://localhost/mysite to http://domain.com).
The settings of the sections are saved in JSON format in your database and always consist of the “content”-strings and a checksum (sum of the characters in the content string).
s:62:"Your content with a <a href="http://localhost/mysite">link</a>"
Now, if there is an image or link with your dev-url in one of the sections and you replace it with the production-url, the characters of the “content”-string and the checkum don’t fit together and the sections will not be displayed.
So you always if to check if the strings and the checksums are fitting.
Best regards,
Kevin