2003 Mazda MPV Rear Cylinder won't collapse

I just had to redo my brakes as it seems they were wearing only on the edges. I brought them back and the store replaced them without a problem. Now I put the new ones on and the drivers side was fine. The passenger side is very tight putting the drum back on to the point that I can not turn the wheel once it is back on. I measured the circumference of the shoes and the passenger side is about 1/4" bigger. I squeeze the cylinder back to bottom it out but it pushes back out about 1/8-1/4" withing seconds. I tried to open to bleeder valve thinking maybe something was under pressure but it just dribbles out. I am not sure where to go with this. It is also hard to tell if when I bottom out the cylinder if the fluid level rises. Is there a check valve or something I could be missing or is it just replace the cylinder? Also if anyone has a drawing of the rear brakes that would be great. Thank you.