Keynote won't move back, only move forward when displaying slides.

Hello everyone,

I have noticed that keynote doesn't move back, only forward. Whether I use my Macbook Pro keyboard forward arrow keys or a Canon remote control, I can move slides forward but when I try to move back to a previous slide or previous effect it only displays a blank screen (or whatever color of the slide).

Is there a setting I'm missing that will allow me to move back in my slide presentation?

Thank you in advance.