I consider myself well educated. I have a bachelor's degree. I am also a terrible speller. I recently added Grammarly to my computer. Wow! Lots and lots of errors.
What I've noticed though is that there are certain things I do with my writing, stylistically, that Grammarly wants to correct. Maybe these things are at least slightly colloquial. I'm from the south.
You'll be glad to know that this entire response, as originally composed, had nothing in it for Grammarly to correct. Maybe I'm not a total dolt.
If you corrected my spelling I would say thanks and change the error.