Is someone accessing my Piwik (no replies)

Hi people,
I have a strnge thing happening some of the Direct Entry visit show only a dash followed by the date and time when I hover over them however the url they appear to be visiting is "http://mydomain.com/stats/index.php?module=CoreHome&action=index&idSite=1&period=range&date=last7" (i have changed the domain name)

Does this mean some one is gaining access to my piwik stats? I am the only one with access to the stats so I am a little worried it may be a hack attempt.

Thanks in advance for any advice