Youtube videos don't fit to area

So I was browsing the forums recently (I feel like that's how all my feedback posts start), and I noticed that youtube videos in comments don't fit/get hidden as it seems like they're supposed to as you scroll down the page. If you look at the top of the picture below, you'll see that the youtube video is placed on top of the general Day9 background, which I'm guessing isn't supposed to happen.

I'm using Windows7, google chrome.

Regards,

Seren