Shared iCloud calendar colour keeps changing
I haven't had this problem for a while, but this week my the calendar my wife shares with me in iCloud keeps changing colour.
I am running iOS 6.1.3 and we have had the shared calendars set up for ages. Now no matter what i do her calander displays as blue, even though it is yellow when i log into iCloud on the web.
When I change to colour to purple on either my iPad or iPhone the colour changes on the web iCloud calendar but displays as blue in iCal on my mac, and in iCal on both my iPad and iPhone.
I haven't added any other new calendars or accounts recently, so I have no idea why this is happening (again)
Anyone else having this problem and/or found a solution?
iPhone 4, iOS 5.0.1