During AoP development the term for Aimed Critical Chance seem to had its meaning changed.
Before resulting Critical Chance was Base Critical Chance + Aimed Critical Chance (max 50+75), so Aimed Critical Chance was a bonus chance you get from aiming, but later in character description all sum (50+75) was called Aimed Critical Chance, i. e. whole resulting critical chance when you are aiming.
So what you said is a display bug from my perspective, but I do not know what description is bugged, it depends on which meaning to use, and I am not sure which we should (cirn/john should tell).