Lightroom CC sync problems from mobile

I'm having an issue with adjustments I make in Lightroom CC mobile not syncing with my computer, but it works fine in the other direction. 

I import photos into Lightroom CC on my iMac and all photos and adjustments sync to my iPad and iPhone without problem. But edits I make on my devices  don't sync with my other devices or the online editor. 
I'm using Lightroom v3.4 / macOS High Sierra on my iMac and my devices/app versions have the most recent updates.