bash i only just noticed that the letters in PIST can be rearranged to ISTP.
did you get ISTP?
Inquisitor what were your numbers (introversion/extraversion especially)? if it's close to 0 then it can switch from INTJ to ENTJ pretty easy. some people are right in the middle.
take the test some more, and an average may develop to either E or I.
i've got 30 results as of now (28 of them viable atm)
anymore?