The issue is caused by the very unique setup of Community Builder and CBSubs. They try to use parts of the Joomla core, but causing issues on other areas.
In this case they store permissions for CBSubs in the Joomla #__assets table under the name "com_cbsubs". This is fine normally, but CBSubs isn't a component (check administrator/index.php?option=com_cbsubs in your backend).
The diagnostic tool of ACL Manager is checking if all components assets really have an extension reference, so ACL Manager checks for a component com_cbsubs, but can't find it and decide "not installed, so should be removed from the assets table".
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