In Reminders, I have set up 4 lists and assigned each one a different colour. My default list is the Reminders list and has always been blue. For some reason, 2 days ago it started changing itself to yellow. Every time I change it back to blue, when I open it again a few minutes later, it's changed back to yellow. I've checked that it's blue in iCloud and on my iPhone and iPad. I've tried turning Reminders on and off again, but still it changes to yellow. It's driving me CRAZY! Any suggestions as to why it's doing this and what I can do to stop it?