You took MBTI, and something felt off. The description was half right and half someone else. You took it again a month later and got a different type. Everyone around you is saying it's so accurate, and you're the only one squinting. If the test just doesn't feel accurate to you, here's why that might be.
It isn't you — it's the theory
To begin with: the mismatch isn't because you answered badly or because something's wrong with you. A sixteen-type test sorts everyone into sixteen boxes, and however much nuance you carry, it can only show the broad tendency. Feeling that half of it is wrong means you're finer-grained than the box — a natural, and honestly a pretty accurate, thing to notice. Studies bear the wobble out, too: a large share of people are handed a different type when they retake it just weeks later.
A result that shifts is a sign you're alive
Getting a different type each time isn't a defect either. Mood and circumstance move from day to day, and if you answer as whoever you are that morning, the type you land on moves too. The result shifts because you don't sit still inside one fixed box. There's nothing to fix in a person who won't stay pinned to a single label.
Try setting down "accurate or not"
The trouble with grading yourself as accurate-or-not is that the checking never ends. Match, and you relax; miss, and you fret — and the loop is tiring. A person isn't a thing to be guessed correctly; a person is something to be read. Rather than forcing yourself into a box and testing the fit, you can read yourself in shades — here's someone who tends toward this — as prose rather than a verdict. Do that, and "right or wrong" quietly turns into "this rings true." If you often feel that none of the types fit you at all, there's a longer note on that.
What spills past the type is where you are
Don't mistake the parts that don't match for you being half-finished. It's in the "sounds like an INFJ, but not this bit" — the but — that you become no one but yourself. And if the checking itself has started to wear you out, there's a note on being tired of type talk as well. Instead of confirming which type you are, you might simply read the single book that is you.