Oftentimes, PDF documents generated by the system do not appear to be following the page set up as designed. The most probable reasons for the same are:

If you are using Acrobat or Adobe readers as your PDF viewer, bring the cursor down towards the bottom and the PDF toolbar will appear

Click on the printer icon to print the document.

Ensure that your page size is same as your Printer paper. Check for correct settings in the PDF Print Dialog.

In the above dialog, you need to change the Page Sizing & Handling to Actual size, before you print.