Getting Social notificationss for Sims on lot, but not in household

I've had several instances of this across several saves now, where I will get a social notification from two non-household sims having a conversation somewhere else on the lot.

"Sim A has learned Sim B's financial status..."; "Sim A has learned Sim B's career..."; etc. while I'm playing with neither Sim, have never played with them, and do not have either of those sims in my household.

In the attached photo, in the notifications, I'm getting a notification for Yoltic, and he is somewhere else on the lot (my Sim also had not interacted with him at all). I've seen this happen with both premade and randomly generated townies