Years ago I had a Traditions Shenandoah that had this problem, I started cleaning the cup after every shoot using the small round wire brush for a dremel in my flex cable and that ended the problem.
My guess is, sticking caps might be due to, at least in part, by powder fouling buildup inside the hammer area. It seems I never have a stuck spent cap until the rifle has been fired a few times, but I cannot swear to that.I've done the same thing and keep the hammer very clean. Still have some caps that stick every so often. Not a big deal to me.
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