repository name overlapping?

I have a private repository named "memotype/home" where I keep my home directory hosted, and I noticed today on my repo page, there is a guy named Eric Van Dewoestine who is also showing up as if he made commits to my repo. It even shows up in the "git log" after I pull... but I don't see any of his actual changes... Is this a name collision which is unchecked by your site or something? I'm very confused and a bit concerned...

I've attached a screenshot of what I see in my browser. I also have a screen shot of the git log where I see this person's previous commits for some reason.