I have got a very strange problem. We have a tasks list on which multiple
assignees are enabled. The expected behavior of the list is that when a task is
reassigned, the original assignees are notified as well the new assignees. Now
here is the problem statement-

I originally assigned it to - A.
Notification goes to A.
I reassigned it to A&B.
The alert goes out to A&B as expected, but also to some random people C, D and
E. The number of people is not defined, and we have not been able to logically
group these people.

Is there any explanation on why this is happening. These people have not
registered for list alerts.