Anyone who has saint cranks.

dox

Just installed a set of saint cranks. What is supposed to hold the stopper plate in place? All bolts are tightened, but the stopper plate still easily flips up. It looks as if it should be pinched by the two halfs of the crank arm, but the bolts are at the correct torque, and there is still a gap.
Any ideas? Surely it shouldn't just flap about?