Fixed #7011

core/src/mindustry/world/blocks/defense/turrets/Turret.java

@@ -477,7 +477,7 @@ public class Turret extends ReloadTurret{
 
             //skip first entry if it has less than the required amount of ammo
             if(ammo.size >= 2 && ammo.peek().amount < ammoPerShot && ammo.get(ammo.size - 2).amount >= ammoPerShot){
-                totalAmmo -= ammo.pop().amount;
+                ammo.swap(ammo.size - 1, ammo.size - 2);
             }
             return ammo.size > 0 && ammo.peek().amount >= ammoPerShot;
         }