I'm trying to remember my training but I know we discussed "double jeopardy" in the RO or CRO course.
From memory, you can only gain 5 points per shot, so the penalty is 10 points per shot. If you are faulting and shooting wrong handed, you can still only earn 5 points per shot so the penalty is still double that, not two penalties. I'm not 100% on that though.
ALSO, I'm of the opinion that 10.2.2.1 does not apply in this case. That rule I believe is in place to prevent giving a penalty for not firing enough shots on a stage, or firing too many, which is already addressed either by extra shot/hit penalties or Mikes. In this case, the shooter still shot 12 shots, so 10.2.2.1 does not apply at all.