That's a matter of head vs. heart. My head knows that once it had made up its mind about something, it will more readily notice and accept evidence FOR that opinion than AGAINST it (or even neutral evidence). But the heart insists otherwise.
An example would be my main couple. I'm very attached to my cast of sims and re-use them in side saves (flashbacks and alternate universes, not unlike your own gameplay). For those side saves I use fresh library copies of Daniel and Gavin, each saved as a single sim household, but sometimes I could swear they recognize each other. Like the time I made them fight for a story, but the moment I had shot the scene, they hugged each other as if to reassure the other "it's just a story Enki is writing, just you wait, everything will be alright."
Heart: "It's as if there is a DanielxGavin shaped cloud in the aether that exists outside of the game and infuses the sims with the knowledge they need to have!"
Head: "It's called projection, Enki. And having an overactive imagination in a game that is predisposed towards positive interactions. Case in point: May I remind you of how it always ends if you try to set up gang wars with the club system?"
