Hello !
Error in calculating the guild power of the Halls of Fame (HF). The calculation performed by the era of the city, and not by the actual era of the HF.

Helper data:
1 x HF 1 lvl = 310
2 x HF 2 lvl = 1 080
In my city are 3 HFs:
Level Age Guild power
2 SAAB 540
2 VF 452
1 OF 235