Retweets showing that I did not do?

[JeffKan1]

I'm finally starting to use my Twitter account that I've had for 8 years. I noticed today that there are several tweets that look like the ones above. I see the "Retweeted by Jeff Porter", that's me. But I didn't retweet them. Have I been hacked, is it that simple? Or is there another explanation?

Thanks!
The title is not the best... I meant "Retweets are showing, and I did not do them"

[xoxo-gossip-girl]

yeah you might've been hacked because all of those tweets that you 'retweeted' look like spam to me... i really think you should change your password