Crimson II - Kick Pedal Clamp slips off Kick Base

I have the Crimson II. Bass drum is secured on carpet and the Iron Cobra 200 Double Pedal is clamped as hard as possible to the kick drum base, but after playing for a few minutes, the pedal clamp slips off the kick base.

I noticed there's a strange bump on the bass drum base and my pedal clamp doesn't extend beyond it.
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