Sign Up Form Disappeared From Blog (Javascript)

Hi

I started a new blog to help out a band I like and start a street team for them. I added a sign-up form by inserting a short javascript that was generated by Aweber, which is the autoresponder service I use (and have been using on other blogs and traditional websites). It displayed and worked just fine, and I did a test signup using it yesterday. This morning I look at the blog and the sign up form had disappeared.

Went in to edit the page where I had installed it and the code was gone too. Reinstalled it this morning and it all back to normal but was wondering if anyone was familiar with issues like this, where a javascript form just falls off?

Thanks! Oh the URL is https://zedheads.org

Thanks again.