Marilyn, are you then doing completely custom reporting? If you use a custom subscription center, clicks on the unsub link will be counted as clicks in the email. One of our installs has a fancy custom subscription page built outside of system action and we found managing the skewed stats was a huge issue.
Allyson, I would suggest building your subscription management center in system action (if you're in E10) if possible, otherwise reporting will continue to be a beast.