Tweet embed not displaying like it should

Hi, there are a number of tweets under the main body of text at http://www.attenzi.com, but as you can see they don’t look nice.

In the text editor each tweet is just pasted on its own line, beginning https://twitter.com….

Looking at the source code, it looks like something is intervening and styling it differently to the normal oembed expected, but how can I tell what?

Thanks for any and all ideas.