I don't think 1/8 of an inch difference means anything. We all know that bbags vary. Even between two bags of the same style - twiggy, city, whatever, you can find a bit of difference in handle and/or strap length.
I recall correctly, the difference between the giant city and giant PT straps was more significant than 1/8 of an inch. So it's probably just that the bag isn't slouching, etc.