Is this a modeling error or historical design for O class battlecruiser ?

[Koisama]

Hi,  I found an interesting difference between Siegfried and Agir, it seems they changed the locations of radars/optical observers, as shown in the screenshots and highlighted. Is this a modeling error or historical design for the O class battlecruiser? Someone, please help, thank you. 

[Koisama]

I double-checked the design of Bismarck, F.Der Grobe, G.K, Prinz Eugen and Hindenburg, it seems like the design of Agir is wrong compared with those existing ships.