Phantom Calendar entries
 

I'm wondering if anyone has this same problem, or an idea of what's causing/caused it... or preferably a solution.

I synced my calendar with my old N95 when I first received my N900, and Contacts, etc

After a bit of clearing up, getting rid of duplicate birthdays, etc... I noticed that on the 1st day of EVERY month there is a blue line indicating a calendar event in the N900 default calendar.

When I open those days, it tells me that there are no events for that day. I can't get rid of them, or see what they are, or anything.

Anyone else?