Why does the size of my part change sizes depending on the location I look?

Why is this a thing, https://gyazo.com/bea0f522c17b5b17aa28ae2876addaae depending on where I look it changes the size, which make no sense

local repStorage = game:GetService("ReplicatedStorage")
local remote = repStorage.Remotes:WaitForChild("RemoteEvent")
remote.OnServerEvent:Connect(function(player)
    local Player = game:GetService("Players")[player.Name]
    local Pos1 = Player.Character.HumanoidRootPart.CFrame.p
    local Pos2 = Player.Character.HumanoidRootPart.CFrame.lookVector * 75
    local blast = Ray.new(Pos1, Pos2)
    local blast, targets = game.Workspace:FindPartOnRay(blast, Player.Character, false, true)
        
        local beam = Instance.new("Part", workspace)
        beam.FormFactor = "Custom"
        beam.Transparency = 0
        beam.Anchored = true
        beam.Locked = true
        beam.CanCollide = false
 
        local distance = (Pos1 - Pos2).magnitude
        beam.Size = Vector3.new(10, 10, distance)
        beam.CFrame = CFrame.new(Pos1, targets) * CFrame.new(0, 0, -distance / 2)
         
        game:GetService("Debris"):AddItem(beam, 0.3)
        
        beam.Touched:Connect(function(contact)
            if contact.Parent:FindFirstChild("Humanoid") then
                if contact.Parent ~= Player then
                    print("Contact")
                        end
                else print("nohit")
                    end
                end)
                    
        end)