Visits are counted with set cookie

Hi all,

I do have the problem, that visits on all my sites are counted even though I did set up the cookie. So when I visit my piwik settings it says:
Your visits are ignored by Piwik on (the Piwik ignore cookie was found in your browser).
But it doesn’t work. I can monitor exactly my visit in realtime with the same browser.

Is that a bug?