I think it's one of those things that happens in every kind of cultural change, it's just more pronounced for you because the accent difference is more pronounced. It happens with people from the US south who live in the not-South and vise-verse as well.

(I say things all the time that cause my co-workers to look at me like I'm an idiot because I've used a phrase/term that I picked up living someplace else. Last week it was "bug-nuts", nobody in my office had ever heard that term before. I don't even know.)