You may be trying to mount guns that are to high for your current gunners.

im probably sure that you are a new player and just got your first nation?

im pretty sure that your problem is that you have no german gunners

Rly this should be Updated to add the current nation and changes but also be part of the NF DL for all new player but see this link if you are newer then 3yrs in NF because even ppl that think their pro for being around 2 or 3 years still dont know much

http://www.nf-guides.com/