Could be through SSL or a potential program like logme-in or even potentially through certain ports that are open when downloading, if it was something massive that was happening to the user database it would of cropped up several times before yourself, maybe look into your router port settings, make sure your pc isn't out the DMZ and while your at it you can always set up some restrictions on your computer through AV software or Firewall software.
Find the a valid source or IP that the potential "Hacker" is coming from first. currently I personally only see a presumption.
Also, Hai we have a
Meet and Greet section where you can be greeted formally :D