Hiya SDM and thanks for starting the thread, and I'm sure the "experts" will chime in ta let you know what ta do to not have it do it anymore. I have a p series witness that is da/sa and does it from the factory, and like that feature with a da. Of course its useless in a SA with the hammer down. My TS's let the safety be engaged at half cock, and if you pull the trigger it will drop the hammer, dont know if it can discharge a round with that distance to travel tho. As ya mentioned that the safety and gun operates fine, my guess is you can leave it be, interesting ya found that lil querk. Be well.