Extra users

I am curretnly importing data from rt2 to rt3 using mysq 4 as the backend.
The data dump was created on 12-12-2003, so there should be no data
after then.
But, I have 182 user that created after that date. In fact I have two
system users as well,
id name created
1 RT_System 2003-12-15 14:47:19
10 Nobody 2003-12-15 14:47:19

Is there a particular reason for those two to be imported so late? Arent
users imported
in the order of their id’s? And, how can I check where the unexpected
users came from?