These tests, although popular, are unreliable. Not because I say they are unreliable. Measured on the basis of test-retest results they produce different results 60-70% of the time. That is basically my point. You aren't necessarily what the test says you are. You aren't necessarily what you think you are. And certainly other people aren't necessarily what you think they are.
Statistically INFP's show up as 4 and 9. Statistically ENTP's show up as 8 and 3
Your INFP's that are showing up as 8's? Send me a photograph etc. and I'll give them some data that might help them figure things out. You can never get enough data and viewpoints for something as important as self-identity.