There's nothing wrong with your account as per our records. It's possible that those e-mails are being opened when you click on your folders. This usually happens if your account is set to open e-mails automatically when you intend to view your folders. I suggest that you change this setting for you to avoid this from happening again. To do this:
a. Sign in to your Windows Live Hotmail account.
b. In the upper-right corner of the page, click “Options,” and then click “More options.”
c. Under Customize your mail, click “Reading pane settings.”
d. Under "When you first open your inbox or another folder, set the reading pane to," select “ Show a message only after I select it. “
e. Click on Save.