There is no specific birthdays, and it's not showing up in the calendar

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.98.158.1020
What expansions, game packs, and stuff packs do you have installed? Packs: Holiday Celebration Pack, Kits: The Sims 4 Desert Luxe Kit
Steps: How can we find the bug ourselves? Well I find it by clicking on the calendar
What happens when the bug occurs? There is no specific birthdays for my sims, I can make a b-day cake and age them up but there is no given birthdays for them.
What do you expect to see? Their own birthdays
Have you installed any customization with the game, e.g. Custom Content or Mods? Never used.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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Here's a picture, there are job days and everything besides birthdays.