Sizing a block doesn't work in online mode?

I'm making a simple audio visualizer as a sort of aesthetic thing in my game. The system works completely in local mode, but when I go into online mode, everything works except for the sizing of the blocks.

while wait(0.02) do
    local byte = Instance.new("Part", game.Workspace)
    byte.Anchored = true
    local vol = ((script.Parent.Sound.PlaybackLoudness) / 100)
    local col = ((script.Parent.Sound.PlaybackLoudness) / 1000)
    byte.Size = Vector3.new(0.2, vol, 0.2) --this is the sizing portion
    byte.Material = ("Neon")
    byte.CFrame = CFrame.new(0, 8, 0)
    byte.Color = Color3.new(col, 0.5, col)
    local scrip = script.Move:clone()
    scrip.Parent = byte
    scrip.Disabled = false
end