In your bootstrap.css file is the following line:
iframe, svg {
max-width: 100%;
}
You'll need to remove that as it's not letting the iFrame, from Facebook, extend beyond it's bounds and getting cutoff like it is.
The compressed CSS file can be found:
new.keune.cc/templates/rt_chapelco/css-compiled/bootstrap.css
I'm not sure if you should edit that directly, or edit it somewhere else and recompile it. That's the fix you'll need though.
Hope that helps,
Alex