Why do the Mannings sound like they have a Different accent ??

I was born in Jackson, Mississippi and lived there until I was about 3 and therefore developed a hidious southern/Mississippi drawl which totally diminished once I moved to Ocean Springs/Biloxi and lived there for a year or two. When I went off to Ole Miss I was often asked if I was from California or the west coast(probably had to do with my constant flip-flop wearing and long hair with Hawaiian-type shirts plus the lack of any accent whatsoever). Most people didn't believe I was born and raised right in Mississippi, although I was referred to as "coast trash" quite frequently. I transferred after one semester in that hellhole called Oxford. I will never go back to that wretched place. I've also noticed on the coast over here that the further west you go, the more "cajun" the accents get, as well as the more French the last names get(I dated a Bourgeois for a couple years from Pass Christian). The opposite can be found the further east you get...tends to get more "redneck" or "traditional southern"as you head towards Pascagoula and Moss Point. By the way, I always cringe when I hear someone pronounce it "New Orleens."