Reloads correctly first time, but can't reload till count hits 0

In my game the gun will reload correctly the first time if its not 0 and will take the correct amount out of the reserves but after that first reload you can't reload again until the loaded ammo hits 0. What am i doing wrong?

 var gunfire : AudioSource; 
 var gunded : AudioSource; 
 var gunreload : AudioSource;
 
 function Start()
 { 
     var aSources = GetComponents(AudioSource); 
     gunfire = aSources[0]; 
     gunded = aSources[1];  
     gunreload = aSources[2];
 }
 
 function Update()
 {
     var ammo = 10;
     var sum;
     if (Input.GetButtonDown("Fire1"))
     {
             
             if (GlobalAmmo.LoadedAmmo >= 1)
             {
                 gunfire.Play();
                 GetComponent.<Animation>().Play("gunshot");
                 GlobalAmmo.LoadedAmmo -= 1;
             }
             else
             {
                 gunded.Play();
             }
 
         
     }
     if (Input.GetButtonDown("Reload"))
     {
         if (GlobalAmmo.CurrentAmmo > 1)
         {
             if (GlobalAmmo.LoadedAmmo < 10)
             {
                 sum = ammo - GlobalAmmo.LoadedAmmo;
                 if (GlobalAmmo.CurrentAmmo >= 10)
                 {  
                     GlobalAmmo.CurrentAmmo -= sum;
                     GlobalAmmo.LoadedAmmo += sum;
                     gunreload.Play();
                 }
                 else if (sum > GlobalAmmo.CurrentAmmo)
                 {
                     GlobalAmmo.LoadedAmmo += GlobalAmmo.CurrentAmmo;
                     GlobalAmmo.CurrentAmmo = 0;
                     gunreload.Play();
                 }
             }
             else if (GlobalAmmo.LoadedAmmo == 0)
             {
                 if (GlobalAmmo.CurrentAmmo >= 10)
                 {
                     GlobalAmmo.LoadedAmmo += ammo;
                     GlobalAmmo.CurrentAmmo -= ammo;
                     gunreload.Play();
                 }
                 if (GlobalAmmo.CurrentAmmo < 10)
                 {
                     GlobalAmmo.LoadedAmmo = GlobalAmmo.CurrentAmmo;
                     GlobalAmmo.CurrentAmmo = 0;
                     gunreload.Play();
                 }
 
             }
         }
         else
         {
             gunded.Play();
         }
     }
 }