Why do I have two calendars in Calendar in Mountain Lion?

I need your help. I have two calendars linked to my iCloud account to the same email address. I tried to delete each one separately, but each time got a pop up dialogue box that I need at least one account associated with iCloud so both seem to be the "main" calendar for my iCloud account. I recently upgraded to Mountain Lion and do not recall whether this problem existed before or after Mountain Lion, or before or after my switch from MobileMe to iCloud. Any ideas? I would appreciate any insight you might have. Thanks.

If you have Time Capsule, you may find you have two identical back up drives one which you can eliminate and one which you can use. I eliminated the one which allowed me to and selected the other (after rebooting Time Capsule) then reconnected to the one which would let me use it. I then shut down ( rather than restart) and was able to back up again. When I checked my Systen Preference under Time Machine and looked at the backup disks the duplicate was back. A call to Apple second level support and I was told this was a known Mountain Line issue ( but nothing about when it would be fixed. Oh, I also have duplicate Calendar entries. Call for a workaround if you can't live with it until they fix Mountain Lion.

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10:00 PM Tuesday; November 27, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
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Why do I have two calendars in Calendar in Mountain Lion?

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