I'd check the front brake hoses.
They can break down inside & cause a flap in the rubber on the inside of the hose.
You can push it down all you want & fluid can come out if the bleeders are open.
BUT that doesn't mean when you release your pedal that the pressure releases.
I would almost bet $$$$$ that if you try & force the piston back into your caliper w/o opening the bleeder that the piston won't go back in. This would cause the same exact problem you are describing w/your front rotors ....joe