"PROFESSIONAL BLACKJACK" & "BLACKJACK SECRETS"

If anyone owns these 2 books, Can anyone tell me why for example the chart on page 43 of Professional Blackjack says to stand on hard 12 against a 3 when the count is 2 or more, and on the very same chart in "Blackjack Secrets" on page 54 it says to stand on hard 12 against a 3 when the count is 1 or more. That is one example, there are many other discrepancies on both charts as well.
Thank you.