This is very likely cause for a problem such as this. The solution is to use a stone to shorten the tip of the ejector rod just enough so that when the center pin is fully depressed it projects slightly past the surrounding ejector rod.

With a blued revolver the next step after getting the tip fitted just perfectly is to apply some Cold Bluing to mask the area that has been stoned. BTW, 2 or 3 applications while being careful limit the area treated to just the tip will result in a difficult to detect treatment because the treated area is so small. Tips, use a fine tipped modelers paint brush and just apply the solution on the bare area of steel. The drill is to apply the solution, wait 5 or 10 minutes until it stops getting darker, then rinse it dry with a wetted Q Tip. Once you have achieved the darkest treatment possible then use a Q Tip wetted with WD-40 to fill the "pores" in the black oxide to act as a corrosion inhibitor.