Calendar not syncing via iCloud

I'm have sync issues with iCloud:

I have multiple calendars on my desktop app. This is where I keep track of all my dates. I have activated all the proper settings (as far as I can tell) for syncing across all devices. (iMac, iPhone, iPad) All devices are up to date. I checked the settings via iTunes on the iPhone and it declares I am set up for iCloud syncing. Same with iPad. I check the settings on the devics themselves and all iCloud syncing is activated.

If I go to the desktop version and display the calendars on the left bar I see three groupings. First is headed "iCloud" and it is all the calendars I created. Second group is ALSO headed "iCloud" and it contains four generic calendars plus the one from the first group that is being synced to all devices. The third group is "Other" with US Holidays and Birthdays; also which I did not create. Only that one calendar which shows up in the first two groups--and does actually sync to my mobiles--had the broadcast icon alongside it; that one and the "Birthdays" calendar have it. So why are these the only calendars with that logo (presumably denoting iCloud broadcasting/sharing)? Obviously I didn't set that one calendar to sync. According to my devices my calendars are in sync.

This has me flummoxed.