SSQV question.

any-one good with bov's?

i have a set of HKSs ssqv's i salvaged from 2 of my old s13's. i fitted them just for fun the other day, they worked fine for the first few journeys, then i think ones stopped working, then the other now neither will go off,

have checked them both have good vacumme lines and boost connections, car is holding boost and vacumme too, they just aren't going off, they aren't seized, noticed one the front diaphragm was off centre and the other was leaking, oiled and re fitted still nothing??? (leak stopped when refitted, and once oiled other was back in correct place.)

any ideas??? TBH got good recirculates if necessary so am refitting them in the mean time.