Both of what I mentioned may come into play.
You may be technically "informative" on the affective (social) level, but the T, which is connected with the conative (Keirseyan) temperament is what will give you your less sociable task focus (the two areas do affect each other).
Also, you could be moderate in the responsive area. Moderation is what led to the idea of a fifth temperament, but in translating back to four, two become lumped together. So "Behind the Scenes" (ISF/INP) can be either Supine, which is very people-focused, or Phlegmatic, which is the moderate one, who can "take people or leave 'em". That ends up being the "typical" INTP, while Supines like me and a few others often seem like Feelers in comparison, and have to work really hard to verify our T preference.
Then with NT being Choleric (contrary to Keirsey), that together with Phlegmatic will produce a very aloof, nonsociable blend, corresponding with an E5. (But even Supines like myself and others, end up as 5, but often with a 4 or 6 wing).