Possibly because blitz just fits for you. Bullet involves less skill and more luck, while rapid is completely skill. Blitz is just in between, meaning luck and skill is involved. Perhaps you have both, meaning that you would be a great blitz player.
Why is my blitz performance worse than my bullet and rapid ones?
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I'm sure a couple of you experience the same condition, but most chess players I've seen are more one sided (either they're very good at speed chess but not as much in long chess, or vice versa).
Recently I've been (working through depression and possibly ADHD) playing blitz and almost reached 1700, before slumping down all the way to 1598. Throughout my games I've lost to many players lower rated than me (by 20-50 rating points) and hadn't won much at all. I used to be decent at blitz (against players near my rating), but everyday since I began slumping it was the opposite.
Yet when I play bullet (both online and real time or rapid (real time), I seem to do somewhat better. Either I get the time to think and come up with a solid strategy, or not really think at all and start blasting pieces left and right. I'm like better with my extremes than my middle ground, which confuses me.
I feel that blitz never suited me much, considering it's somewhere in the middle where I need to balance my time management along with controlling the board. I often stumble and eventually blow away either a draw-ish or winning position.