Fears of cheating happen within 24 hours

New save, new sims created by me as married. One sim gets the fear of being cheated on less than 24 hours into playing. This is absurd. Second sim gets the same fear later that day, despite having both talk the first day and the second. They have literally not even been apart for the entire time since creation. This fear has always been unreasonably quick to happen without any sort of cause, and it's now even worse than before. Neither sim has the jealous (or loyal, since that is still broken too) trait.