ical color

Hello,

I have a problem with the ical calendar sync with iCloud.

I got 5 calendar and two of them change their clor automatically, and when I try to change the color to backup the original one, it turns after few second on the color that I don't want....

example:

My work calendar was green since the begennin, it turns on violet, i chose the green color in the settings and it only stay green for few seconds and is back on violet....

Could you help me to resolve it ?

Thanks.