cactuspete -- FWIW, here's possible explanation (similar minor dicrepancies occured in my account as well). It looks like sometimes the only information submitted by a hotel computer to the HHonors computer is the total room charge, including tax. Then HHonors computer recalculates the total taking out the taxes. I guess the information on the amount of taxes each particular property charges is not always up-to-date in the HHonors system, thus resulting in minor discrepancies, not unlike the one you see.
In a very similar fashion, when my stays were non-taxable (certain state institutions are exempt from taxes on lodging within their own state), the HHonors computer tries to deduct the amount of taxes from eligible charges even when that amount does not include any taxes in the first place.
Hope I did not confuse you even more!
[This message has been edited by Eugene (edited 03-13-2001).]