it was before match and we after some jogging and stretching we go for the lay ups for me it is good to this part but i tried to make a from stand dunk i know my vert from stand not too high but something strange happened when i tried to jump i found my self nearly the rim dunno how i was shocked for that i left the ball in the air i tried to do it again but can't go to that vert again is that normal to happen or wat ???

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position :PF,C
height:6.56
stand reach :8.8
run vert :14.5
2 legged jump : 13 or less
after rest for 3 weeks
run vert :24inch
2 LEGGED JUMP:23 inch