I have seen this issue and in my experience it was due to settings in the Publisher or the Data Source override settings were not set correctly.
Edge sets permissions
If you want the permissions set at the edge device be sure to have the Override sent permissions checked at the edge publisher and not at the Data Source on the cloud server.
Cloud Server sets permissions
On the Cloud Server, Data Source check the Override permissions updates and uncheck the Override sent permissions at the edge publisher.
Please let me know if this helps. If it doesn't let me know what version/s of Mango you are running to further assist.