How do I remove screen scrolling in published project?

Hi everyone!  I just ran into something weird that I've not seen before.  I'm working in Captivate 9, version 9.0.9.437 and using a responsive project.  I have a series of slides, all duplicates (basically a cartoon).  Device and slide height are locked.  Slide 1 is a basic slide - cartoon of two people with caption bubbles.  In Slide 2, I used a custom line animation to have one of the people move.  In slide 3, that person has a caption bubble.  So here's what's weird.  When I preview this, a scroll bar is showing up on slide 3.  It's on 4 of the five views - not the mobile portrait view.  Any ideas about why it's randomly showing up?  It's not the end of the world, but it's pretty annoying.  So far, I've been the cause of most of these "glitches" but I can't figure out what it would be here.

Thank you!!!