Doubleclick.net Nonsense

Here’s something I’ve been running into for a while:

While browsing a forum, I’ll click on a thread, read it, then hit my back button. Nothing happens.
When I look at the previous page dropdown, it’s filled with one address 20 or 30 times, as though I went that particular address repeatedly.

the address is http://ad.doubleclick.net/N622/adj/stra

Is this malware on the Dope, on me, or is it some part of the ad system that the Dope has and just goes haywire on occasion?

Are you guys in league with [del]the devil?[/del] Doubleclick?

This also happens to me frequenty on my work computer, which uses IE7. It never seems to happen on my personal computer, which uses Chrome.

It is annoying.

I mostly run into it other places. I’m guessing that it’s showing one address for each ad on the page. And, yes, it is annoying.