Problem

When expanding an 'Expand' macro on a page, the macro immediately collapses half a second after and the data within the 'Expand' macro disappears.

Cause

This is because there are some <div></div> tags and classes enclosed within the storage format of the affected 'Expand' macros that shouldn't be there:

<div class="expand-container conf-macro output-block">
  <div class="expand-control">

Resolution

1. Install Confluence Source Editor if you don't already have it installed.
2. Edit the affected page(s).
3. Click on the <> symbol on the top right corner of the page editor.

4. Search for the following classes:

   <div class="expand-container conf-macro output-block">
     <div class="expand-control">

5. Remove it from the code, along with their closing </div> tags.

6. Click on 'Apply'.
7. Save the page.