Fixed layout epub displaying incorrectly on PC, but correctly on Mac

I have a fixed layout epub that I created in InDesign. The file displays correctly in ADE on Mac, but is a mess in ADE on Windows (the text is huge, the images are scattered, and most content is off the page). The file also displays correctly in iBooks and Calibre on Mac (I only have a DRM version on the PC so I can't view in Calibre for PC). What might the issue be? What additional information can I provide to help troubleshoot?