Hi, Prinz.

A couple of things to check:

Does the cocking piece bear on the side of the slot in the receiver before engaging the sear?

If so, there are several possible explanations. 1. The bolt lugs are unbelievably worn. 2. The receiver is unbelievably worn. 3. The cam track at the rear of the bolt is damaged or dirty. 4. The safety stud on the cocking piece is missing, incorrectly located or damaged.

If the cocking piece appears to be centrally aligned before contact with the sear:

The full bent (nose) of the cocking piece has been butchered by someone trying to adjust the trigger pull. 2. Ditto for the sear. 3. Could be both components are faulty. Note: If too much material is removed from either component, the driving flat on the safety lever will not engage the front notch in the LHS of the cocking piece correctly and will get chewed up. Cocking pieces are differentially hardened; the front end is seriously hard, whilst the rear is reasonably malleable. (Sorry, tech docs not to hand at present)

Peter Laidlericon's point about the spring is very important. If the closed and ground ends of the striker spring are roughly finished, they will bind on any surface imperfection on the rear of the striker collar or inside the rear of the bolt body. One addition to this is burrs and "dags" on that rear of the striker collar caused by striker tools with damaged or incorrectly manufactured driving lugs. If the bolt handle flips up when dry-fired, spring torque is one of the causes.
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