Blog HTML in blog post changing
 

We have an event going on today and I'm trying to embed a twitter widget into a blog post.

The code I trying to embed is this:
HTML Code:
Tweets by @TeslaRoadTrip
When I save the post, what i'm supposed to see does not show up, even after refreshing the page. I then go to edit the post and what I want (sometimes) is visible in the WSYIWYG edit plane. But if I save again, it doesn't show in the actual post. If I then switch the editor to source mode. I see the HTML has changed to this:

HTML Code:


So what's going on and how do I get it to work? Why does it only work momentarily in the editor?

Thanks.