Hi,
I had similar problem yesterday and I was able to resolve it.
In resetpass-form.php the input field has data-reveal attribute:
<input type="password" data-reveal="1" data-pw="<?php echo esc_attr( wp_generate_password( 16 ) ); ?>" name="pass1" id="pass1" class="input" size="20" value="" autocomplete="off" aria-describedby="pass-strength-result" />
The problem comes from the Zurb Foundation reveal plugin (WP-Forge theme) which uses same data attribute data-reveal to initialize the modal dialog
