When you close the bolt, the cocking piece pin is driven rearward by the cocking ramp and at full bolt open that pin is set on a divot at the top of the ramp holding the firing pin at full cock. At this point the firing pin is retracted with no protrusion. As you close the bolt(The cocking piece pin applies pressure to a part of the sear that protrudes into the bolt lug raceway) the cocking piece pin begins it's fall foreward while pushing the sear "lever" with it by function of the trigger hanger pin as a pivot, the bottom portion of the sear swings rearward and catches on the trigger.

To me, It looks as if the bolt is closed and the sear has not advanced rearward. If what I am seeing is true then for some reason the firing pin is possibly binding and not allowed to move freely.

This leads me to the question, have you disassemble the bolt recently? If so did you disassemble the firing pin?