Slides transitioning on their own in powerpoint 2003

I am using powerpoint 2003 to make a jeopardy game for my students. I've got
it all set up and I can click on the points in the first slide and it will go
to the corresponing question using the action settings, and visa versa, I
have a bitton on my the answer page that takes me back to the first slide.
However, when in the slide show, when I try to transition back to the first
slide, it takes me there then it transitions to the second slide on its own
without any clicking on cues. And it's not always consistant with how long
it takes to do this, sometimes a second or 2, sometimes as many as 10-15.
I've noticed that It seems to do this whenever I move the mouse on time slide
to select another question. Why is it doing this?