Why is my blitz rating on 600 points lower than my USCF

I don't understand how it is possible to be a 2100+ USCF rated player and have a rating in five-minute chess of 1550. Some of the difference might just be that I am bad at thinking fast, but, come on, 600 points??? Judging from my opponents' opening book knowledge I would put them as mid A-players, about

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My Daily chess.com rating is 1800 but my 5 minute rating is only 1500. Is this simply because Im weaker at rapid play or is there another reason for the variation of