White Rectangles Printing When Exporting to PDF
Help! I'm new to InDesign and can't figure out what is happening. I am creating a document for my classroom and when I export the InDesign file to a PDF, I'm getting random white rectangles on my printouts. Everything looks fine in print preview but not on the actual print. I'm using the PDF preset "high quality print". I've tried changing the standard and compatibility options and none of the settings are making a difference. I'm sure i'm just missing a setting or something. Any suggestions would be much appreciated! Thank you in advance. I've attached an image below of what is happening.

