Problems compiling PDF for KDP paperback

I’ve been working on this for hours and I can’t figure out why the margins are all messed up when I compile to PDF and then view it in Amazon KDP for my paperback. I’ve tried changing my margins all around, I’ve made sure the book is the correct size in compile options in scrivener. Is there some secret trick to doing this to work for compiling a PDF to use for kindle paperback? I’m about ready to just bag this whole thing and go to Word.