So, with the B hull on the Omaha you get 8 quadruple 28mm 1.1''/75 caliber anti-aircraft guns.
When you open the AA specification window and take a close look at them, you´ll notice there are:
2 mountings on the rear end of the superstructure
6 mountings, 3 each side in the middle of the superstructure.
However, on the front cheeks of the command tower there are another 2 mountings, clearly visible, yet uncounted and without a owm camera position.
Sooooooo: Either remove the mountings or count the front ones aswell.