Reply to a text are sent back to a different number than the number where the text was sent from
I receive a text from phone #1, when I reply, the reply goes to phone #2. A reply should go back to the original number not a different phone number.
In this case, I have both phone #1 and #2 listed under the same contact. The reply should go back to the number it originated from, not an alternate number.
Looks like an IOS bug. Why is IOS changing the number on the reply?
iPhone 11 Pro