I recently got a new regulator off Amazon. It immediately had problems with the PSI creeping up so I disconnected it from the tank, depressurized, and took a look at the diaphragm. I cleaned out a bunch of crud (little specs of metal, dust, etc.) which is something I’ve done for my old regulator with excellent results. The thing is, after disconnecting and depressurizing, the gauge now reads about 4 PSI. I gave it a flick in case it was stuck, no luck. Any ideas?