Not My Stats, ????? Options

[Bubba (TM)]

I checked my stats from yesterday's play.

I did a lot better than what I thought. (I pretty much sucked yesterday.)

When I clicked on my name it said I had all these kills with a sub-machine gun
and a rifle. (I didn't use either yesterday.)

Do stats track by IP or username?

Does this mean there are two Bubba's out there? (If so, that sucks.)

If someone cheats using my name would you be able to tell the difference?

I am asking because a lot of you know that fooly cooly aka krispy kream aka dominance
doesn't like me all that much and I'm afraid he would use my username and cheat to get
me banned. (Just like he did with Druid on the other server.)

Thanks for any info.