My round-robin not behaving

[Michael Voight]

Joseph S D Yao wrote:
> 
> > >QCT wrote:
> > >> I expect to see
> > >> >foo
> > >> Name:    foo.blat.com
> > >> Addresses:  1.2.3.4, 5.6.7.8
> > >>
> > >> >foo
> > >> Name:    foo.blat.com
> > >> Addresses:  5.6.7.8, 1.2.3.4
> > >>
> > >> and back and forth, REGULARLY.  This is not the case.  I see 1-to-1, 2-to-2, 2-to-3, 1-to-3 round-robin and the behavior is completely unpredictable.  Is there a randomizing switch somewhere that I have overlooked?
> > >
> > >(1) yes, but
> > >(2) have you checked your logs to determine whether your observed
> > >results are only part of a larger pattern?
> >
> > That was the first thing I thought of, so I fired up named on my test box.  Nobody is using this one except me and I observe same behavior as the production box.
> >
> > QCT
> 
> Per your logs?  E.g., if you are using 'nslookup' ON that box, it does
> a reverse lookup before the forward lookup, which could mess up your
> results.
> 

Almost confused here, Joe. :) 
How does a reverse lookup mess up the round robin of a forward lookup.

Michael