Are the archangel cavalier crystal drop rates wrong?

I opened 15 of these and got no 5* or 6*. With a 28.5% chance to get a 5/6*, there's a 0.65% chance to only get 3/4*s from 15 crystals.
Am I actually that unlucky? Or are the drop rates messed up?
Am I actually that unlucky? Or are the drop rates messed up?
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