FB Messenger Screwed-up

Hi,

I need help on resolving the FB Messenger on both my wife's and mine. We both have our own separate FB accounts and corresponding Messenger. Just yesterday, we noticed that when I am sending photos from my phone unto my wife's Messenger, she will receive these photos in a Messenger which is my name. Clicking on the messenger profile, it will go to my FB profile. Basically, our Messengers are switched.

Looking at her Messenger nicknames, it show two, hers and mine. How do I remove mine on her Messenger nicknames? Sliding it to left is not an option neither. There is no vertical 3-dots.

Thank you for all recommendations.