I’m so confused

How the fuck are people in an artillery truck hitting me behind cover across the map after i shoot one mortar, this guy killed me 4 or more times after shooting one mortar and i’m behind cover. Last time i checked the artillery truck doesnt have a map view like the mortar truck or the mortars used by the support class. This guy was pissing me off so bad i raged and got off before i smashed my tv into bits. I use that fucking truck and get nothing but hit markers if i’m even lucky, most of the time my artillery shell doesnt even hit the enemy.