My experience has been that the levers are pretty soft steel and bend easily if one gets a failure to feed and tries ti force the issue. I purchased an 1895 that had a similar problem, just not as advance as you are showing, I removed the lever, layed it side by side with another and bent the lever to match the working one. That did solve my issue, which was the lever flying open at each shot.
Many claimed it was the detent and I should put new springs and all that, but it was indeed a bent lever. Upon reflection, where do you suppose they will bend? In the finger guard, the only unsupported area and the lever screw is the fulcrum.
My opinion, FWIW, compare the curvature against a known working lever and proceed from there.