HI welcome to the forum. have you thoroughly cleaned the pistol? my first thought would be gunk in the sidplate or sear or a worn out trigger spring. light hammer strike shoudnt apply to this becuase you would have to caulk the gun again to reset the trigger. If dirty or worn perhaps the first pull primes the sideplate arm and the second pull is just enough to pop to the sear. also is the firing pin spring and breach block free of debris?
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