I have exactly the same issue, and would catagorize this Mac behavior as a "bug". It is very confusing, when using an iOS device and mac, and you expect things on the mac to happen as they do on iOS.
Topquark
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Post
Replies
Boosts
Views
Activity
Make sure you are not running over a VPN (for Mac and for device). I killed them, and it seems to work now.