Mysteriously added text downloading to Acrobat Create PDF Online

Question

Working on Acrobat.com's create an online pdf web page I
downloaded a Word Document from my pc to Acrobat.com and opened the
Word document (on Acrobat's web site) to find the document
different than the original Word document on my pc.
The Word document (as well as the pdf conversion displayed
next to it) on the Acrobat.com web page mysteriously had an added
line of text showing a previously unknown date (January 9, 2006)
inserted before the body of the original text but under the
original page header. The font also looked slightly different
throughout the body and header of the document and the document
itself was extended to 3 pages long instead of 2. In the conversion
the now added 3rd page also mysteriously included the standard
header and footer and renumbered the first two pages to include
this new 3rd page (page x of 3) in the footer.. When I went back to
the original Word document on my pc nothing was added or changed.
I downloaded another Word document with a different page
header from the same pc to the Acrobat webpage and while that
document looks graphically slightly different there was no text
added.
It seems that there must be some sort of embedded legacy date
code or script at the beginning of the Word document that while not
visible in either the reveal codes side pane, or showing up in any
way when working or printing the document in Word is somehow
revealed in the text of the document when downloaded to the Acrobat
site even before its converted to a pdf file.
How can I manage this?

Answer 1

I am using Windows XP Professional O/S and Firefox as my
browser. I get that the font options will change the file as opened
at Acrobat that may change the layout,
but,....
how do you explain the mysterious extra date 'string' that
appeared at the start of the word document as it showed up at
Acrobat's website?
Since this is standard out of the box Word and included fonts
(garamond 12) why does this do this.