Incomplete form appears when weak password is submitted

Having a weird issue with 1.6.4 of this plugin and WP 4.3.1 where, if a user clicks a link that takes them to the change password screen here…

http://oi65.tinypic.com/34qlh94.jpg

…and then enters a weak password and clicks the “Reset Password” button, they get sent to a another page here…

http://oi68.tinypic.com/156zj2q.jpg

…which has an incomplete, unsubmittable form. Any ideas?

https://wordpress.org/plugins/force-strong-passwords/