Why does it give me secondary ammo?

I have an entity that should give a custom weapon + primary ammo when I press E on it, but it gives secondary ammo instead.

Entity +use code:

function ENT:Use( activator, caller, useType, value)

	if (caller:IsPlayer()) then
		if caller:HasWeapon("ghostball") then return false end
		caller:GiveAmmo( 1, "Pistol", true )


I have setup the SWEP’s ammo type like this:

SWEP.Primary.ClipSize		= 1
SWEP.Primary.DefaultClip	= 0
SWEP.Primary.Automatic		= false
SWEP.Primary.Ammo		= "Pistol"

SWEP.Secondary.ClipSize		= -1
SWEP.Secondary.DefaultClip	= -1
SWEP.Secondary.Automatic	= false
SWEP.Secondary.Ammo		= "none"

When I press +use on the entity, it gives me the weapon, and +1 ammo in the secondary clip, instead of +1 ammo in the primary.