I'm very logical for a NF, and while I like to think I base my decisions on logic most of the time (i'm pretty analytical too), the truth is my emotions/values will override my thinking/logic if the two are in conflict. I'm highly personal values/morals oriented.
I'm very sensitive and i'm pretty sure I cry more than most guys do (like at sad movies/shows and stuff, i'm not depressed or anything hehe ), but I will never do so if i'm around other people. I guess I can see why people would think that i'm a T.
Anyway, I guess this kind of shows you can't always judge peoples types by their behaviour unless you have a lot of knowledge about the system and the person.
Edit: Not to side track or anything, but do male (or female) INFJ's have this problem? Or would extraverted feeling tend to show itself more.