Windows Calendar changes color of agendas

[AstridD]

Since yesterday (probably after the windows update); the colors of my agendas in Windows calendar are changed.
If I change them manually back to the color that I addressed to every separate agenda, it lasts for 20 seconds, and then it automatically switches colors again.
Very annoying and confusing when I open my calendar now!

 

[Talisman39]

Has been happening for me too. Maddening! Wouldn't be so bad if it wasn't picking such ugly bright colors...