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Last I checked we are photographers and not snipers - just saying! Anyway, I tend to do this subconsciously for who knows what reasons. Crowded reception and don't want to accidentally step on someone's feet by stepping back? Too busy trying to compose a shot with my face glued to the camera to think and physically take a step back when all I need is that little bit of lean back to get it just the way I need the shot to be?
FWIW, this is not me in this photo, it's my old assistant.
I caught myself doing this same type of pose earlier this year. I pointed it out to my wife (my newer assistant). I told her I'm calling it "the photographers thrust". When I realized I was doing it, I was "fine tuning" a shot through a bush.