I figured out what is going on. If you look at your settings, you have elemental sharpening stones selected. Those can only be applied to sharp weapons, not blunt ones. Therefore when the punisher is equipped you effectively have 2% less crit, making it an worse weapon in this setup. If you want them to be considered equally you should remove the sharpening stone for the main hand from your settings.
This brings up an interesting issue… to get a more fair comparison when you have sharpening stones chosen, we should put a weightstone on the blunt weapons for comparison.