It's the ejector wire. It needs to be tweeked. Use the nickel high / nickel wide as gauge on the wire. The wire should sit a nickel's thickness above the feed throat and with the lifter pushed down sit a nickel's thickness to the right of the inside of the feedthroat.
To prevent further instances of potentially bending the wire again, always lock the bolt back when reassembling the action into the receiver.
I am still going to post a photo asap but my poor 99 is an ugly duckling compared to yours. The wood and finish on yours appears NIB. I am also missing a rear sight and am finding it impossible to locate. One was listed on Amazon for $159.50! I will scope before that.
Mine was pretty rough when I picked it up in an auction for $110, with the rear sight. Don't hate the player, hate the game. I cleaned the stock with Murphy's Oil Soap and applied multiple coats of tung oil. I took the action components and the bolt from a 1983 vintage model 60 and put them in the 99M1 side plates. Shoots great.
If I didn't have the rear sight, I would remove the front sight and pay my local gunsmith to drill and tap a hole and install tech sights.