iCloud email update notifications despite not selected
I'm sharing my calendar with my wife via our iCloud accounts. Two days ago every event I put in my calendar she not only sees in iCal but now gets an email notification.
There is an option in iCloud.com->Calendar to "notify me by email if calendar changes" but we both have this selected as "no".
We are both getting emails from our iCloud accounts about updates.
Is there anyway to fix this?
Thanks,
Ryan
MacBook Pro, Mac OS X (10.7.3)