iPhone messaging problems
This happens when I send a message to myself (iMessage to the same Apple ID). 

Are you logged into separate Apple IDs? Check by going to Settings > Messages > Send &amp; Receive. Check both phones to see if they have the same Apple ID.

If they Do, here are instructions on fixing it:


You'll need to log out of iCloud and iMessage on one device
On this device, go to iCloud and create a new iCloud ID.
This keeps the ability to share purchases in iTunes &amp; App Store, while changing the iCloud and iMessage IDs.