I have the following in my <body>
<div class="g-recaptcha" data-sitekey="some-key (original is right)">
and this on my <head>
<script src="//www.google.com/recaptcha/api.js"></script>
but nothing is shown, either on firefox or chrome... Is this a known issue?
Answer
make sure that <script src="//www.google.com/recaptcha/api.js"></script> is the last thing before closing of head tag.
That fixed same problem for me