It sounds like you're lifting or swinging your foot into your target instead of thrusting it. Your foot seems to be hitting your target at an angle. After chambering your kick, slowly extend your leg till the ball of your foot hits the target. Make sure your foot travels in a straight line. If your trouble is what I think it is, That should correct it. Form first, Then speed. Hope that helps.
Good Luck!
Mike.
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PSN: BanditsPledge
Live: Schutzwaffen