Why is the explosion spawning where my character spawned?

wait(3)
Player = script.Parent.Parent.Parent
n = script.Parent
mouse = Player:GetMouse()
run = game:GetService("RunService")
local debounce =  false
function pizza(mouse)
	if debounce == false then
		debounce = true		
			local x = Instance.new("Part")
			x.Shape = "Block"
			x.CanCollide = false
			x.TopSurface = "Smooth"
			x.BottomSurface = "Smooth"
			x.Transparency = 0
			x.Reflectance = 0.3
			x.Parent = Workspace
			x.Rotation = Vector3.new(-89.998, 0.013, -89.972)
			x.Size = Vector3.new(10, 5, 10)
			x.BrickColor = BrickColor.new("Institutional white")
			x.Name = Player.Name
			y = Instance.new("BodyVelocity")
			y.maxForce = Vector3.new(math.huge, math.huge, math.huge)
			y.velocity = Player.Character.Torso.CFrame.lookVector*60
			x.Parent = Workspace
			y.Parent = x
			f = Instance.new("SpecialMesh", x)
			f.MeshType = "FileMesh"
			f.MeshId = "http://www.roblox.com/asset/?id=51226819 "
			f.Scale = Vector3.new(10, 5, 10)
			h = Instance.new("Explosion")
			h.Parent = x
			x.CFrame = Player.Character.Torso.CFrame*CFrame.new(0, 0, -10)
			game.Debris:AddItem(x, 10)
			x.Touched:connect(function(Part) 
    if Part.Parent:FindFirstChild("Humanoid") ~= nil then
		script.Disabled = true
		for i = 1,20 do  
        Part.Parent.Humanoid.Health =  Part.Parent.Humanoid.Health -1
		wait(0.05)
		end
		script.Disabled = false
    end
	wait(0.025)
end)
		end
		wait(60)
		debounce = false
	end


function onSelected(mouse)
	mouse.Button1Down:connect(function() pizza(mouse) end)
end

n.Selected:connect(onSelected)

Explosions don't inherit the position of their parent. You need to define their position and then parent them.