Wow. That's insane.
As Vel said, study the functions; don't rely on an online test. The one you reference typed me as ENFP. Absolutely NO ONE would mistake me for an ENFP.Test scores. I did the test four times within a months period, and it only changed every so slightly. Ni and Si conquered all, but in reality I'm Fi dominant (INFP). I just so happen to undermine and ignore my dominant function every single day, which leaves me feeling lost and dead inside.
Keys 2 Cognition - Cognitive Processes