I have 4 private calendars in my iCloud account, and I've been using them for the last 2~3 years with no problem.
I think it was last week when I first saw my blue calendar changing its colour to purple. I don't know who/what did it, but I just changed its colour back to blue and forgot about it.
Well today I checked my calendar and it's purple again. I changed it back to blue, but I get a feeling this might go on if I don't do something about it.
The last time I remember doing anything to my calendar settings was exporting the data at the end of last year. Other than that, I use the app everyday to set appts, change event date/time, delete event, etc.
Do you have any thoughts on what caused it or how to fix the problem for good?