This has been bothering me for the longest time now. I consistently score low on extraversion (MBTI not big 5) (usually moderately expressed introvert. sometimes low expressed introvert) and yet I relate more to the ENFP descriptions than the INFP ones.
similarly, I am type 8, but most of the negative qualities of type 8 I'm like "I would NEVER do that!" It's not that I don't do them, just that I don't recognize them in myself. the 8 descriptions make them out to be these horrific tyrants who oppress the weak and helpless, but, even if this were true (and I'm sure it isn't. for 8s who are even partially healthy at least) an INFP 8 sounds more like the guy who would destroy the tyrant or beat up the bully...and probably get a kick out of it (I suspect a number of INFPs mistype as 1s who are really 8s). 8s are also seen as overly argumentative and confrontational, but I think most of us just appear this way because of the way we talk.
I can see an ENFP 4 or an ENFP 9 being more introverted, but I feel like an ENFP 8 or 7 would be really extraverted and have much higher energy than I do. one of the reasons I didn't relate to 8 was I was comparing myself to my ENTJ 8w7 friend who is so choleric that he would actually enjoy being jumped by a group of thugs and kicking their asses.
also, as a child, I was not noticibly 8-ish at all until around 13-14 (except I would have short periods of unusually high confidence and then all of a sudden be shy for awhile). even then, it took me a few more years to gain more confidence (but once I did get it, it took off like a jet) it would also explain why half of me wanted to be like a dragon ball z fighter or a powerful, dragon slaying swordsman who waged war and the other half wanted to be a classy, tea party having prince who hung out with mostly females and played with cute animals all day (my parents did not know what to think of these bi polar interests)
the thing that confuses me most is that INFP it's description seems like it would be the LEAST likely of all the types to be an 8.
PS: I have to admit though, almost all of the enneagram descriptions make one seem to go "Oh dear! I hope I'm not that!" the descriptions seem to bring out the negative far more than the positive.