Hi callaway,
We see you're having an issue with the read status of messages syncing across devices, and we'd like to help out.
We noted you mentioned that the Mac doesn't reflect the messages on the iOS device, but does the reverse OK? If you read the message initially on the Mac, do the iOS devices reflect the message being read?
Also, double-check to see if you have Messages in iCloud enabled on each device. Details on ensuring that's set up can be found here: Use Messages in iCloud
Be sure that all devices are updated as well:
Update your iPhone, iPad, or iPod touch
How to update the software on your Mac
Take care.