PBA: Because they don’t accept conversions by Rabbi Angel. Rebdoniel, instead of trying to find a Beis Din that will accept it, why not go through the proper channels? Jumping from beis din to beis din is not the proper way to do things.
Contact the RCA and explain your situation to them. I’m sure they’ll be more than happy to help you out. And if you have to go dip in the mikvah one more time, so what? Many people do it every day!