InDesign CC won't export the entire document to .pdf
I am using Adobe Acrobat Pro DC and InDesign 2015 CC. I created a 7.5" x 10.25" document with .375" bleed around all edges for final dimensions of 8.25" x 11". The top and bottom bleed don't have any elements and is plain white. However, when I create a .pdf from InDesign, the top and bottom are automatically cropped. When I check the properties of the .pdf, it displays 8.25" x 11". However, when I sent the file to the printers, they asked for a new file because the file I sent doesn't have a bleed.
Does anyone know why InDesign is automatically cropping a .pdf due to white space? So as a quick workaround, I created a rectangle measuring 8.25" x 11" and filled with white and placed on its own layer behind the rest of the elements and created a new .pdf. This time, InDesign exported the entire document into a .pdf measuring 8.25"x11".
I would like to figure this problem out so I can avoid this issue in the future. I also don't like my boss thinking that I don't know how to create a .pdf with a bleed. Unless I don't? Am I missing something when creating a .pdf with a bleed?
Is there a setting somewhere that needs checked when I'm dealing with whitespace? Thanks,