No its not normal. I just went outside and checked and mine both go back the same distance (I know, silly, but I just HAD to check). Maybe there is something keeping your passenger seat from going all the way back?
Hers:2012 Mustang GT Premium,6M,Kona Blue Exterior/Charcoal Interior, 400A, HID/Security Pkg ,Comfort Pkg.
[COLOR="DimGray"][B]His: 2014 Mustang GT Premium,6M,Sterling Gray Exterior/Charcoal Interior,400A, Reverse Sensing/Security Pkg, Comfort Pkg SMR# 3635