slides jumping to next slide when time line ends

Hi, I'm sure there's a simple answer to this, but I have a scene where the slides will jump to next slide without prompting or clicking next button and there is no jump to next slide trigger when the timeline ends.

These were slides imported from power point so I'm wondering if it's a function of that at all ?

Anyway I cant work out why this is happening and how to resolve it , any help would be very much appreciated 

Thanks Altan