[Plugin: PTM AJAX Comments] Works but get warning after sent the comments

https://www.fashion-bop.com/fashion-bop-things-about-us/feedbacks/

You could try it.. settings are the default ones.

Warning: Cannot modify header information – headers already sent by (output started at /*****/html/wp-includes/comment-template.php:1348) in /*****/html/wp-includes/pluggable.php on line 897

https://www.ads-software.com/extend/plugins/ptm-ajax-comments/