DataContext Conflicts with no Member conflicts

Question

I am getting a ChangeConflictException when I try to SubmitChanges using my DataContext. The submit is attempting to do 8 updates with each update being only a single field in the record. When I catch the exception, I have looked at the .ChangeConflicts and there are 8 of them, but here's the weird thing, the .MemberConflicts of each conflict are empty lists. The DB isn't in production yet, so I'm the only one accessing the table, and this is 100% repeatable. What could be causing this?

Doing a little looking, I found some sources that recommended putting a timestamp on the records for optimistic concurrency, so I did that and set those fields' timestamp value to true. That didn't seem to help anything.