Since English is not my native language, there may be some inaccuracies in spelling or phrasing, though most of my posts I naturally write in Russian.
Are you using paid version of Grammarly? In some grammar correction tools they are using AI to completely change the structure. It is one thing to correct is/am /are (we all would agree on that) but it is not accepted to make posts in a manner
which is not representing your true ability. I am sure you know much more than I do regarding this.