The safety is supposed to cam the striker/firing pin back off the sear a little when its applied A little bit of chamfer/lead angle helps accomplish this.
My guess,it worked right when it was made.If someone removed steel at the sear /trigger faces.the striker will be slightly forward,and may not cam.Any of those parts could have been changed,then not fitted.
There are parts availableStudy what is there,see what you find.Quite fixable
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