horse and pet age up with age up off

I have the horse ranch and pets pack, and I just found that you can change the calendar to make seasons occur on 28 day cycles instead of just 7 day cycles -which occur to fast for how I play. So, when I toggle the seasons to 28 day cycles, my horses and dogs (who are part of households of course) now have age up countdowns. My sims are fine -no birthdays on the calendars as it should be, since I age everything up manually with cakes, but the horses and pets have countdowns. I play with age-up off for all households (played and unplayed), and that is very important to me because I collect characters from shows I like by making them in the sims and playing with them. I don't have many horses or pets, but I don't want to be worried that the bug could affect my collection, so I felt this was very important to report. It appears that when you go to another household before the countdown for the animal is up, and then go back to the household with the animal, the countdown is reset. I don't know if that could help you guys identify what is causing this, but I figured it was important to note.