Plugin seems to be causing some website issues Noindex

A broken plugin is causing severe damage to my website. As I previously inquired in this thread: https://support.rankmath.com/ticket/incorrect-http-header-content-type-text-html-charsetutf-8-help-me, I haven’t stopped investigating the damage. I’ve received definitive answers from my hosting provider and Plesk Support Engineer, as shown in the attached images. Experts have confirmed that the damage is not caused by me but by your plugin, as shown in the images

https://imgur.com/a/v84bVqP
https://imgur.com/a/LueCP8T
https://imgur.com/a/DOWkxIs
https://imgur.com/a/Ka8xIlZ