I’ve tested the theme and it is outputting the recaptcha.
The problem is styling around the form element… it’s hiding the lower content. You can fix this with the following CSS:
#commentform .g-recaptcha{ clear:both; }
The overriding belief in these forums is that when there’s a problem with Shield, Shield is the problem. These features/functions are rock solid at this stage as they’re quite mature. And while there will always be bugs (I found one while looking for this problem, but it’s minor and unrelated), the best thing to do is dig into the page source where you expect to see output and see if you can find it and go from there. Work under the assumption that it is working, and when it’s not, it could be another 3rd party theme/plugin interferring. This sort of investigation really helps us also find any problems more quickly.
Cheers.
Paul.