Tested collector app using Windows 2010 Surface tablet, Android, and Apple devices. Adding a related tables using Surface stores the GUID differently than Android and Apple devices do. Because of this, I can't view a related record in my Android or Apple device if it was created via the Surface. related recods # collector
Are you downloading the maps for offline use or are you making edits directly to the online web map?
Is Collector up to date on all devices. 10.4 is out for Windows 10, Android, and iOS.