I’m seeing the same thing as Bob..kind of shadowed, but the one stone looks to be too long.
Do you have one in the other pallet forks that’s a bit shorter, that you could swap out ?
Can you shorten the existing stone ?
The only other thing that comes to mind is that something is binding when you add the pallet fork/pallet bridge assembly.
When you are adding them back into the movement, can you get the movement to free up more if you back off the bridge screw, and /or does the movement run when you have the bridge on “loose”, and it stops when you run the screw down tight ?
I’ve seen where a warped bridge or plate, or an out of alignment plate jewel has caused a watch to stop.
Thanks for the pics !!!