Timing...
The bolt is supposed to hit the ramp at the top of its travel and that helps bump the case backwards which is usually enough to unseat it and allow easy extraction.
Most likely, in your case, the bolt handle does not engage the ramp before the end of its rotational travel and therefore does not get that leverage.
Look at the tip of the bolt handle closest to the rear action ring and you will likely see it does not touch the ramp cut in the rear of the rear action ring.
Repair involves having the bolt handle removed and replaced in the correct place.
