My sim's lifespan is being affected by something in the new update

This past week, I made a new pair of sims. The woman could impregnate, and the man could get pregnant. My game is set to long lifespan, and the woman's lifespan is fine. But after the man got pregnant, I noticed that his lifespan was only 4 days, and he was about to be an adult. I had to get the potion of youth to reset him, and then his lifespan was still only 4 days long. It's a problem. While his woman has the normal length of time for a long lifespan. I don't want to play with them if he's just gonna age up unnaturally after the pregnancy. I shouldn't have to give him the potion every 3 days. What's going on?