"Jump to Slide" only works forward...not backwards!

Hi,

I'm trying to create a button that, when clicked takes the user to the first slide again. The slide with the button is slide 35.

The "Jump to Slide" is selected and I choose Slide 1.

When I test it, preview it or publish it, it just goes to the next slide.

Creating  a button to jump to a slide past it works fine, but it seems that jumping to a previous slide simply does not work

Any ideas?

Cheers