All visitor statistic plugins have the same bug

I was looking for a statistic plugin for WordPress 3.4.1. During my testing of several plugin (e.g statify, counterize, wassup, slimestat etc.) I found a problem that all plugins has in common. If I’m logged in as admin besides the correct logs they are logging junk (there are entries for pages I have not visited). If one plugin has the option to exclude users from logging and I excluded my account they are still logging the junk. If I’m not logged in everything works fine. Is there any incompatibility with the wordpress version or where is the problem?