Well... if you are listed under your IP, then any traffic during that time won't be counted under your account. This may be due to either logging in from a different IP (e.g. school or work) or you have dynamic IP that changes. If you have a static IP, or you never log in from elsewhere, that shouldn't be a problem.
Oh and if you happen to use DHT, turn it off because you may lose some stats that way as well.
Quick checklist, before you start your torrents:
2. Go to profiles, uncheck lock IP, press submit
5. Go to profiles, verify that your IP matches in lock IP box, check it off, press submit.
6. Start your torrents.
7. Wait a bit, and check back to see that your torrents are listed under your profiles (click on profiles first to update page)