Pull all the way back on the charging handle, the get your finger in front of the bolt and push the bolt back more.

The front face of the bolt should stop/max out rearward 1/8" to 1/4" in front of the back of ejection port window edge.

If the bolt face is coming back past the back of ejection port (ejection port with a spring loaded cover on it), then you have either the wrong receiver extension, buffer, or buffer spring in play.

As for if the bolt face is stopping at the correct distance in front of the back edge of the ejection port window, either the recoil spring is weak as hell, the gas port is too large and the rifle is over functioning (no back of stroke stall, but instead the buffer is bouncing off the tube and being sling shot forward instead), or the batch of bolt catches were not correctly annealed after they where initial heat treated instead.

To add to this, the bolt impact mark to the bolt catch does seem to be greater than normal, with maybe the bolt catch springing up higher that it should be to start with. Or worse, the hammer bottom releif cut not high enough, bolt catch channel slightly back that where it should be in the receiver, and it could be the hammer crashing into catch instead that is snapping  the catch.

P.S, Where did you get your POST certification for the  SR-25/Mk 11 Mod 0/M110?