[jQuery] [datepicker] Offset problem

Hi there all,
I am using the latest version of jQuery-UI and in particular the
datepicker. On the one site everything is perfect but now, using on
another site, the datepicker opens up offset about 30px above the input
field.
I can interact with it and it does fill the correct field if a date is
selected, just not sure why the offset is happening. Any ideas?
Thanks,
Schalk Neethling