Have you installed some sort of spell checker that automatically "corrects" certain words? I used the word "not cool" in reference to my own memory and it came out as "not cool" when it was posted. I was impressed - nice way to clean up certain language.
It just corrected the first "not cool" that you typed. Yeah there is an automatic language filter that prohibits certain words. If you get by that, there is the banned by the moderator feature that goes into effect.