The knob mode could cause jumping but not always to 127 unless the knob is always hard at max when it is moved.
I suspect that the sound you transfered did not come over to the polar cleanly. Try to transfer it again if that isn't mending the problem recreate it on the polar.
If the patch is not too precious you could post it here or attach it to a pm and I/we can have a look if your problem can be recreated and potentially find the cause.
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