I've got to get on my other computer to look up the FB details, I'm pretty sure it was the last build before the most recent one. Looking on the site, I see I used an Iframe to hold the form, it's on SDrive.
The iframe markup points to http not https:
<div id="framecenter"><iframe name="lets-talk" marginWidth=0 marginHeight=0 src="http://www.callie.coffeecup.com/forms/lets-talk" frameBorder=0 width=100% height=711px scrolling=no></iframe></div>
On S-Drive we do not offer SSL services so you are going to get an alert there because the iframe markup is calling something over http.