Bodyguard B Ignores Divine Shield

I understand that, but that doesn't explain why some attacks, from the monsters I listed, will get "Guarded", but the rest will go through. You can't sit there and tell me that their one and ONLY magic attack will randomly gain some form of "Physical" damage property out of nowhere.

Did the monsters you listed ever manage to pass Divine Shield? I'm pretty sure every one of those use a skill that is magic-based damage. Take a quick trip to El Nath and test Yeti's ground smash and Werewolf's claw attack. Those should use skills that deal physical damage.