I just bought an older Winch Mod 21 in 16 gauge and the ejectors work perfectly when the gun is dry fired. But the left barrel one will eject just as soon as the gun is opened when both barrels are fired with ammo. The right barrel ejector waits until the gun is completely opened as it should. The knotch in the left ejector hammer look sharp not worn and the ejector sear tip doesn't look worn either. Any ideas please? Thank you.