Ships can fire through shields sometimes

[RCIX]

If a ship is on one side of a forcefield and a target is on the other, the shot will go right through the forcefield to hit the target. Demonstration image is attached.

[Fiskbit]

I don't think this one will be considered a bug. It'd be nice if you could block access to something from some directions using a forcefield, but the reason why shots can travel over force fields is roughly the same reason that multiple ships can be on top of one another: depth. Space isn't flat, so even though AI War usually tries not to, it does takes advantage of this fact sometimes.

[liq3]

What fiskbit said.

Also, figuring out if they'd hit the shield is rather expensive CPU wise. The way it's currently implemented saves on CPU a lot.

[Revenantus]

Remember that the 2d game environment is actually a representation of 3d space. Although the structures appear on the other side of the force field, they can be considered to lie in a different z plane, hence the missiles that are hitting them are being fired above or below the force field that's in front of them.

[x4000]

Yep, what the others said, this is not a bug.  In general in this game Line of Sight means nothing because of the pseudo-3D space.  Of course, that also is part of what makes the astronomically-high unit counts possible.