Hi TheFlash035,
Thank you for giving us the chance to assist you with your iPhone. You can count on us to do our best to assist you or get you pointed in the right direction.
We understand that you are getting two message thread from the same contact.
We’d like to gather additional details that may help us be in a better position to assist you.
Have you had the chance to check If you have duplicate contacts?
If yes, the articles below may help.
Hide duplicate contacts on iPhone
If you see duplicate contacts after setting up iCloud Contacts
Please keep us posted.
Take care!