Messages sent from one iPhone showing up on another?

There are 2 iPhones on one account. Just yesterday, a message was sent from one but it appeared on the other and the other received the reply. Something did come up on the original iPhone but it is not remembered what it said. It was about settings. It was working fine before. How to I put things back?

It must be syncing the messages as they are on the same account. Try switching one to a different account in settings or in messaging.

If you have both apple devices linked to the same email the iMessage will send to all of your apple devices linked tithe account.

To get rid of it…

Go to the phone that you personally use and open settings, then messages and turn off iMessage.

Another way is to create a separate Apple ID that way the two phones aren't linked to the same account

Hope I helped

message sent from one I phone, reply appears on another I phone ( different numbers) bizarre