syncronize

I have Office Professional 2003 on both my home computer (laptop) and my
office computer (desktop). I have a Compac i-pac PDA with cradles for
synchronization on both computers for the purpose of synchronizing all of
them for contacts and calendar. When I synchronize with the office computer
and then the home computer, one-day recurring appointments now spread to a
two-day range. A weekly appointment spreads to multiple two-day
appointments. To correct these problems individually, I can open the
appointment, open the recurrence, click on "OK" and then "save and close" the
appointment. Voila, it is back to one day even though I really didn't change
anything -- until I try to synchronize again. HELP!! How do I keep this
from happening again and again?