Are there any earlier documents where BHO Jr's mother (SAD) is known to have written the correct birth date for BHO Sr? If not, I don't see how the incorrect birth date would be anachronistic. BHO Sr. may well have lied to SAD about his birthdate and, once he found out that the date he had given her now appeared in an official document, started using that date in other documents as well. I don't know if that happened, but it would certainly seem plausible.
The "Rathergate" documents had numerous glaring anachronisms, stemming from the fact that the letter spacing and formatting conventions precisely matched that of a system which could not have been invented until decades later. If the document had supposedly been created in, e.g., 1988 (a few years before MS Word started using the default settings and behaviors in question) one would have to consider the possibility that the creator of the document used some obscure program that existed in 1988 (but was not well known), and that Microsoft copied the behaviors of that program in some later versions of Word. With the documents supposedly dating back to the 1960's, however, it's completely implausible that anything in the 1960's would have behaved as MS Word did in 2003.
If one were to examine 1,000 birth certificates from the hospital where BHO was born, and find that every other one was formatted identically, then formatting differences might be a red flag. On the other hand, one can imagine a variety of reasons why some documents might be formatted differently than others (e.g. it may be necessary to interrupt some other job to type of a birth certificate, and the other job might use different tab stops; a typist wouldn't normally change tab stops just to do a few lines on a single document, especially if it would then be necessary to change them back).
At this point the entire document is so riddled with crap it’s a crap sandwich, just like everything connected with the lying usurper in the White House and all his enablers, assistants, supporters and excusers.
If you think the document (actually now there have been two, one white and one green, or maybe there have been three) is not a forgery, nothing and no one can help you.