This is not a bug, it was my wish.
All the fences are treated like walls.
That's useful to help you defend your base in the upcoming CTF and Domination.
But if I declare them "wire net", the bullets can pass through.
see The Pic. Im Fixed LandMine in up Blasting in Down Also.
How can you call that a bug?
That's the trigger radius.
It's independent of maps, building structures and positions.
In fact you should say "thank you" for that.