Don't worry, I'm pretty sure I'm an INTP.
If I remember correctly, I've got results (in other tests) varying between INTP, ENTP, INTJ, INFP and ISTP.
So either I have multiple personalities or the test isn't that accurate.
You seem to have changed from INTP to INTJ and then to INFP though. Have you settled down now, or are you doubtful yet?