When you go back to a slide, PPT always returns you to the end of the slide.
For some ways around this, check out this entry from the PPT FAQ:
Animations don't play when I go back to a slide http://www.pptfaq.com/FAQ00598.htm
--
Kathy Jacobs, Microsoft MVP OneNote and PowerPoint
Author of Kathy Jacobs on PowerPoint
Get PowerPoint and OneNote information at www.onppt.com
I believe life is meant to be lived. But:
if we live without making a difference, it makes no difference that we lived
Alexandre Vieira,
That is normal behaviour, PPT will return you to the finished state of the
slide. The common workaround is to insert a blank slide, with a 0:00 sec
automatic transition, just before the slide you want to return to, and
hyperlink to that blank slide.
See here: http://www.technologytrish.co.uk/secondhyper.html