It's possible that you've got an implant that gives you targeting bonuses and you possibly forgot that you installed it.
Anyway.. speculation here is pointless.
Get your characters into eveboard.com and password them (unless you want the world to see what skills your toons have). Do a side by side comparison (assuming you gave each-other the password
). Skills that are different can be hi-lighted. You'll also see what implants your toons have that might affect your targeting ranges.
It's quite possible that it's something assumed that shouldn't be etc.
Have fun, good luck and fly safe,