Prescott Family Tree

If I open the family tree using Mei Prescott, it doesn't show that Tai Lum is her father, if I open the family tree using Tai Lum, it doesn't show that Mei is his daughter nor he's having any descendant, but if I open the family tree using either Molly or Amy, it shows the complete family tree. The only solution to this was to open the CAS and click save, and then everything back to normal.

I'm using version 1.98.127.1030 on PC