LUK clutches are the brand most mechanics will only use around here,or they stick with OEM parts from a dealer...anything else is a crap shoot..
I had a new clutch in my VW Jetta diesel that was installed days before I bought it,and the disc did the same thing--a spring popped out and got wedged in the pressure plate ,so it wouldn't release...
When I took it apart I could still see the ink printing on the disc that said "Raybestos"--after I bought an LUK clutch at Pep-Boys for about $95,I learned the diesels need a different disc with rubber cork like cushins instead of the coil springs,I guess the diesel's vibes and torque are too great for a gas engine clutch disc with the coil springs,though they are otherwise identical..