Trebuchet networked range bug

[Astotes]

Hello,
When in Artillery mode, the range is supposed to be 6500 while attacking marked enemies.
In the mission GDF 5 for exemple (the Trebuchet introduction), my Trebuchet is attacking a marked target at the max range of their network range, the projectiles simply don't touch the target while I can see the max range of the network (just martain your mouse on the unit). the projectiles fall at 5500-6000 range and don't touch the marked target.