Random Navigation Bug

Hello all,

I create courses in Storyline and assign specific pages to the Next and Back buttons of the player.

When I then publish the course (via Review 360) the navigations on some pages keep changing to "next slide", which disrupts the navigation.

This also happens sometimes when I click on a single slide in the story overview: suddenly the navigation is changed. Sometimes to a specific other page.

I always assign the pages in the slide view.

How can I fix the error?

Thanks!