Storyline Block in RISE adding a gray box

I've added simulations I've made in Storyline to Rise many times. However, I'm creating a course right now, and this is the first time I'm seeing this issue. As users scroll past the Storyline block, this gray box shows up between the Storyline block and the subsequent block. This box sometimes shows, sometimes doesn't, sometimes it's really large and other times its just a few pixels tall. Any insight on how to get rid of it?! It's making it confusing for learners to proceed in the course.

 

 

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