Most likely, that's the case. Can you please open a separate thread in the bug-section of these forums? That way it's easier to keep track of things.
Here is bug outside of the WBP. I was experimenting with a weapons team style for USF. So I decided to use Cheap Team Weapons bulletin for well cheaper weapon teams. I noticed that while is says cost of these weapons will be reduced by 5% it only really does about 1 or 2%. I think the problem is that it only applies to the cost of the weapon itself and not the crew members.
The location of the bulletin is upgrade\intel_bulletins\ardennes_rewards\support\cheap_team_weapons, in case if you all have trouble finding it.