Articulate 2: slides running on their own!

Hi guys, 

This is the first time I have such problem: in my latest Articulate course the slides are changing without user interaction after the end of the standard timeline (5s).

This happens despite making sure that there are no trigger to jump to next slide at the end of the timeline.

 

It's also the first time that I import slides from powerpoint. I checked on the original slides and they have no time/transition/animation strings attached.

 

Any suggestions?

 

I could, of course, make the timeline much, much longer and this will virtually resolve the probelm, but would rather understand where this is coming from and what I've done wrong?

 

This problems happens when I preview the course on Articulate, and also on the publishes version on the LMS (Moodle). Any ideas?

 

Thanks,

Aurelie