I've diasbled all plugins and let only cron, Slimstat and Comet, run Comet Cache auto engine cron, then use Anonymous browser and there were no access in stats, but when I access as admin I can see my stat. Also if I browse the page while it's not cached and then in anonymous browser I can see the access stat. I don't know why this is happening, it was working really good. In slimstat I have everything set to be compatible with cache plugins. Even if I stop using slimstat js file from CDN and use the local one it's doing the same problem.
Referencing internal/private ticket. https://secure.helpscout.net/conversation/344686367/0/