Cutscene lerps different speeds for other people?

I have this zombie rounds kinda game like undead nation. But there is a cutscene that has the camera lerp. My friend says his cutscene is slower than mine and it is still playing after mine finishes. Can anyone tell me why this heppens?

local camera = workspace.CurrentCamera
local Cameras = workspace:WaitForChild("Cutscene1")
local Cameras2 = workspace:WaitForChild("Cutscene2")
local CameraPart1 = Cameras:FindFirstChild("CamLerp1")
local CameraPart2 = Cameras:FindFirstChild("CamLerp2")
local CameraPart3 = Cameras2:FindFirstChild("CamLerp1")
local CameraPart4 = Cameras2:FindFirstChild("CamLerp2")

repeat wait()
	camera.CameraType = Enum.CameraType.Scriptable
until camera.CameraType == Enum.CameraType.Scriptable

for Num = 0,1,.0005 do
	camera.CFrame = CameraPart1.CFrame:Lerp(CameraPart2.CFrame,Num)
	game:GetService("RunService").RenderStepped:Wait(0.05)
end
for Num = 0,1,.00085 do
	camera.CFrame = CameraPart3.CFrame:Lerp(CameraPart4.CFrame,Num)
	game:GetService("RunService").RenderStepped:Wait(0.05)
end
wait(workspace.StoryScript.Time.Value)
workspace.StoryScript.BlackScreen:Clone().Parent = game.Players.LocalPlayer.PlayerGui
wait(2.5)
camera.CameraType = Enum.CameraType.Custom
script:Remove()