Q: multiple copies of iCloud calendars and notes

I logged out of iCloud to try to solve an email problem and when I logged back in it started making three of everthing (except emails, thankfully). I have three copies of every note and calendar, which is a bit of a nightmare. If I delete one I lose everything. I tried making a new calendar so I could move everything to that instead, but it promptly made three copies of that too. I can't just turn the extras off because when I add new items it adds them to different ones. For example, I have three 'reminders/schedule' calendars, with the first one checked. But when I add a new item it goes to the second 'reminders/schedule', so if I don't have that one turned on I can't see my reminder.

I also have different stuff showing on my phone (linked to the same calendars) than I do on my computer.

I should also say that some of my calendars are subscribed to, and I can't delete those ones at all.

It's a mess - what can I do to fix this?

thanks!