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i would agree with Mykeal that the marks are made by the hammers .
As to why they are doing that , one would have to look at the gun to find out .
I would think though that if it was being cased by firing one side with the other side at full cock , the movement would be enough that you would have both barrels firing .
That much movement should , I would think , be enough to trip the lock from the full cock notch if the locks are tight as you have said .
Now it could do it if there is forward and back play in the cock . IE the tumblers neck is starting to wear and thus let the hammer move back and forth under recoil but not so as to have that recoil actually move the tumbler .
The other thing that could cause this is blow back . Is the gun cocking to the ½ or full cock after being fired . If so then now that’s not safe as it will cause damage to the sear and tumbler . Over time it also can get so bad it can snap the cock right off the lock as it allows the cock to travel to fare back when its subject to pressure from the main charge
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