as aardvark said it could have something to do with the internal surface of the bottle, also the bottlescloser to the back of the fridge will be in a slightly warmer air flow due to the compressor at the back of the fridge/freezer.
The bottles at the front will also act as a wind shield of sorts for any cold drafts so will in effect have a greater wind chill affecting them.
if it was cold enough (i dont think it will be) once you start pouring and it gets a surface for it to freeze on it it may then freeze - we get this all the time at work with acetic acid thats stored outside (freezes at 14°C) looks fine when you get the bottle as soon as you pour it out you get an ace icicle as the whole bottle freezes instantly.
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