Passenger side caliper not totally releasing

Lol, I just went through a similar scenario. this weekend.
Mine were initially frozen open ( 4 piston Kelsey Hays ), I broke them lose and played with them 'till they were floating freely with the bleeder open.

But the passenger side froze up on me on my way to a show (short drive), I had to break the brake line loose(to relieve the pressure) and pinch (vise-grips) the flexhose in order to drive it home.

The first thing I'll be changing is the flex lines, as I believe it might be colapsed on the inside, therefore somewhat locking the fluid from flowing back in the line (as there is no pressure on the fluid return).

I'll be a few days before I get to it, but it's an inexpensive start.

All the best!