Strange behavior with markers

Hello! I'm new here and I've been working with markers in my file.  Here's the background:

• This is with a slider interaction - 11 total slide positions
• Each slide position has it's own layer with 1 or 2 markers on it (only 1 slide has 2 markers on it).
• I've added the audio narration to the marker itself. It plays flawlessly.
• When I return to a layer and hover over the marker, it is distorted.
• When I click it, it returns to normal, even when hovering over it.

Here's what I did to troubleshoot:

- removed the audio from marker and placed it on the layer - no change

- changed the state of the marker - no change

- changed the property setting on the layer to "return to initial state" (this messed up my variable for restricting the next button)

- reset the base layer to initial state when revisiting

A Beginner's Guide to 3D Printing | Review 360 (articulate.com)

The course above is what I'm working on - the slide in question is "Meet your Ender 3"