users are reporting that iMessages threads are merging for different contacts. If you are texting with one user in iMessage
all of sudden some other contacts start to appear in that thread from nowhere.
The iMessage is not able to maintain
thread properly and mixing up messages in threads and showing message from different thread. The issue is seen with
iPhone users using same AppleId. Suppose four people using same applied try to
imessage each other the messages will start to appear in other contacts message
thread. With same apple id the imessage threads are mixed up in iPhone/ iPad.
working with correct thread list is not seen with iOS 11 but in iOS 12 is
reported by wide users.
How to fix iMessage message
thread merged in iPhone:
merging threads you can try below fix:
Solution 1: Notification
Grouping to OFF
has now change in Notifications that will allow a number of the same types of
content to be in a single notification. First make sure to delete all iMessage
threads where messages are merged. Also delete and re-add the contact. Now restart the iPhone.
you will see a setting for Notification Grouping-> by default it is Automatic.
Turn it off, and then all of your messages will show individual notifications
and not just a single notification if you have multiple Messages. It could
possibly fix the message mixed up issue in iMessage.
Solution 2: Update send
& receive settings
-> send & receive. Make sure you only have your phone number checked. Do
make sure your Apple ID is not used for iMessages.
fix the iMessage message thread mingling issue permanently please create separate apple id for each