Why is my icloud calendar has been automatically the colors associated with my calendars.

Yesterday 8/13 evening my iCal started randomly and automatically switching colors assigned to my indvidual calendars. So, my calendar is colored blue and my daughter's is pink. Suddenly my calendar was pink and hers blue and then 5 minutes later it would switch back. It is also affecting my desktop calendar which synchs with iCloud. So, I went to the source and tried to change the colors back at iCloud. I did that and then 2 minutes later while I was watching, the colors switched back. How do I fix this?