1) Please check after 12 hours. It may resolve automatically. Also for PRO version user there is no more extension to use. All are included in PRO version.

2 + 3 ) as i mentioned in this topic https://www.shamimsplugins.com/support/topic/issue-with-front-end-pm-pro-layout/#post-22876 you can remove all your code and use shortcode fep_shortcode_new_message_form instead. pass heading="Message" in that shortcode. It will show “Message” instead of “Contact”