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There's a diagram somewhere showing where (on the frame/stem) the clamp should and should not contact, I think overuse can spread the clamp a bit causing it to hit the wrong bits (though I have an ancient swb bike and the clamps on it are fine so...?) so would be worth checking that while you're at it.
Springs are after market add on. They don't fit the older hinge type found on short wheelbase bikes.
Fwiw though, I don't have the springs on the one of mine which could take them and don't really find them neccesary, my clamps don't seem to get 'jammed' though so maybe something else is wrong?
Wait, do you mean that you(r partner) undoes the knob and the clamp bit doesn't release? The springs are meant to stop the clamp rotating to save you like 0.0001seconds when unfolding the bike, not to push the clamp off the frame.
The clamp in the pic looks a bit marred up on the inside, I'd be tempted to remove it and clean it all up and have a look at the faces it presses into to see how they look. Maybe some excess paint or a burr or something?