The JP hammer springs are considerably lighter than an OEM hammer spring.
They will very often cause light strikes, especially on harder primers like what you'll find in surplus import ammo, and even #41 5.56 primers.
I used reduced power JP springs in my AR builds and recently have had to replace one of them due to light strikes.
It also may not be a bad idea to take the bolt apart and make sure there isn't a lot of fouling in the channel where the firing pin goes through either.
I don't know about anyone else, but I also store all of my weapons with the hammer released to eliminate undue prolonged tension on the springs.
I know it's been a hot button topic about springs taking a set, but I feel better doing it that way, so that's how I do it. As always, ymmv, take it fwiw, etc.
if you give them an inch, eventually they will be a ruler.