I've noticed that not all available weapons capable of firing DON'T when using the default Fire All Weapons key, even when I change it (to space bar).
For example, if I use the standard Tac/Escort weapon layout (3xDHC + 1xTorp and 3xTurret) on my Tactical Escort Retrofit only 2 DHC's and 2 Turrets will fire along with the Torp.
Because of this, I use 2xTorp + 2xDHC and 1xTorp + 2xTurret just to get them to fire properly.
I notice the same issue with my KDF ships.
In all instances the target was well within the proper firing arcs.
Is this normal or am I missing something because pressing "fire all weapons" seems pretty straightforward.