In the picture below, only one user is shown as having a birthday this week:
In the picture below, quite a few users have birthdays this week, but their usernames are not showing on the calendar row on the forum:
In that last picture, be_love99's birthday is today, but her username isn't showing on the calendar row. Her birthday isn't showing on calendar.php either. It's like it is randomly picking who shows up and who doesn't. There are 8 birthdays that should be on the calendar row right now within these five days.
In the ACP I have the following feature enabled: ACP -> Configuration -> Icy Phoenix -> Icy Phoenix -> Inactive Users In Memberlist And Birthdays' Block....YES.
What could be causing this problem?