Nothing on the forgot login page was touched recently. It works perfectly fine on our demo site below.
demo.cbdemosites.com/community-builder/forgot-login
If you've any form of caching or CSS/JS compression installed/enabled be sure you clear all the cache after each update. If issue persists press F12 to open your browsers developer tools while viewing the forgot login page, next refresh the page, now check the Console tab to see if there's any fatal JS errors (typically they'll be red).