Go to this sticky
to find Revvy's VERY INFORMATIVE bottling thread. Post #8 will give you the info on why some beer bottles carbonate differently.
Each bottle is it's own environment. How long has it been since you have bottled the beer? I find that if I have uneven carbonation between bottles it is because I have been drinking bottles close to the 3 week mark after bottling. When I leave them a little longer, the carbonation evens out between different bottles.
Fermenting: Grand Cru, Belgian Dubbel, Nut Brown Ale, Saison Sans Soul
Kegged: Honey Amber Ale, Centennial Blonde Ale,
Gone but not forgotten: Irish Red