Could you email me your rules? If you are registered, you can use the export function, otherwise, screenshots would work. If you have a sample file which consistently shows this, then zip it up and send that as well (make sure to zip it as it should hopefully preserve the dates). Click the "Contact Support" link in the "Info" tab for the email address.
Also, I'm assuming you are looking at the "Last Opened" in Finder and not going off the access date in Terminal.
Thanks.