Thanks for the insight, but not for one minute did I suspect a full blown mod issue - in Sancho we trust
I understand now why Sancho Gallery does it but I suspect the main instance of my VN has either a messed up save or persistent file somewhere and for what it's doing I can't be bothered trying to fix it as it doesn't affect my own saves/routes.
I sorted name & Rooster/pet names as soon as I loaded the save. I also noticed later when I played those scenes back from the main game scene gallery, the names got flipped the other way with the old name being used for the 'speaker' and the updated pet name in the text.
Ultimately, those scenes are not on any of my routes and I was just curious about how the storylines panned out for the return of Cathy & Nora in Ep10, hence using someone else's save.