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That happens if you don't let the page load fully. It should switch to a rich Twitter embed. It can take 1-5 seconds for the Twitter embeds to load. It also happens if a Tweet was deleted.

This is how it looks for me.

If you have some sort of ad blocker, you might be blocking it as well. Try turning it off and see if it loads, but first reload the page and see if it pop ups.

Oh yeah, I was gonna mention I had seen it in that manner too. It takes up a lot of space doesn't it?

It does, but I'm ok with that. I think it makes the comment section look better, and brings attention to where it is being shared and talked about, especially when it is someone else who tweeted your post. I find it very valuable information, but that's just me.

To each their own.