Adobe Acrobat Pro 2017 Question

I'm reposting here because I think the first time I posted it may have been in the wrong spot?  Sorry, new to this forum. 

I have Outlook emails that I have converted to pdf (they are bates stamped which means they are numbered) -- now I have to go back and recreate the pdf's using the same emails and they must remain the same length but they are not.

I go into the exact same email and the first time I converted it, the length was 4 pages, now its 5 or the first time its 3 and now its 10.  They have to remain the same size for numbering issues but nothing works (or nothing I can figure out).

Any thoughts or help?  I've also run into it not converting the email at all but giving me a .log file, so yesterday all in all was a fun day!