It appears that the Spreads PDF has a rendering issue when loaded into Firefox on Windows 10. However, using SumatraPDF, it renders fine.
I have no idea if this is your fault, or something you can fix, but I figured I'd tell you. :)
Thanks! The files are a bit unwieldy due to all the images. I'm uploading a different version right now that will hopefully help.
You're awesome! I just also noticed that if I zoom out of the doc, the rendering fixes itself. PDFs are weird.
They are SO WEIRD.