As Brian said, the upper nose of the combo sear is not engaging the notch in the hammer. This could be caused by a number of things. The plunger pin tip could be slightly worn and not pushing the sear slide forward enough to allow the sear to be pushed up by the sear spring to engage in the notch. The cocking toggle could have some uneven wear and it's not pushing the ejector hammer back quite far enough to allow the sear to engage. If the gun is loose on the joint this could exaggerate the problem. Your best bet would be to remove it from the wood and give it good cleaning and lube to make sure there is no dried crud in there. If that doesn't help then send it to someone if it bothers you.
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