I'm playing a multiplayer campaign with my brother and none of his provincial capitals have defensive wall artillery even though he has the building which provides them. (He's playing as Pontus) Is this is a bug or are we missing something? I tried searching the forum but couldn't find anything about this problem specifically. Here
is a screenshot where you can see that he doesn't have the little white siege defense icon next to the other city defenses. Here
is a link to the building where it says a level 3 should grant 3 defensive wall artillery. Conversely, all my province capitals as Rome has the appropriate siege defenses and do have the little white artillery icons.
Any help would be appreciated.