Wrong user name appears on stats

Although I am logged in with my usual user name for this site (www.dailyimpact.net) a message in the stats column says I am logged in with a slightly different user name (which I used for thomasalewis.wordpress.com) and am not authorized to look at my own stats. Just above this is a message welcoming me, and using the correct user name. This occurred today. I have not moved or altered the site