I am helping a co-worker with a problem, and we are both new Access users.  
The problem is within a subform.  In the past, I was able to enter new
records into the form and they would remain in the same order in which I
typed them.  Recently, my co-worker asked for my help when the records he
enters move automatically to the top of the subform and no matter what I do
to try and move them back to the bottom, they automatically move to the top.

My co-worker suggests that it could be because he copy and pasted some
records from one form to another.

How do I fix this problem so that the records I type remain in the order in
which I type them?  Thank you.