Did you use teflon tape on any of the line fittings? Could you have a piece of that tape interfering with the fluid - lots of pressure pushing but ZERO retracting and a little bit of that tape could retain enough pressure to hold the caliper out??
Is the caliper piston(s) "free" when you take it off the rotor and push the pad back? Is it still free if installed on the rotor and you attempt to push it back?
If it's not - I agree with Vegas - could be a defective piece.
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