Jetpack stats: Blog visualised by unknown author

Hi there,
here’s my issue.

In the ‘site stats’ area of my blog, I can see how many times my pages have been viewed by external users and, in the ‘author’ section, how many times I have visualised it (I am the only author).

However, as of lately, in such ‘author section’, besides me there’s a new user (with no name, no picture) which keeps visualising 2 or 3 pages a day, always the ‘about’ page, which I never open, so that can’t be me.

I haven’t accidentally created another author, of that I’m sure. So what about it?
Did someone break into my site?

Here’s a screenshot: https://snag.gy/bFeRlp.jpg

Thanks and hope you can help,
cristina