Rotating the primary part of a welded model

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1

When ever i move a model with a script I made:

mainpart.CFrame = character.Head.CFrame+cameralook.LookVector*10
mainpart.Orientation = mainpart.Orientation + rotation
mainpart.Anchored = true

it makes the model spin around for some reason and I can’t
figure out why

Example:
the table(model welded to primary part with motord6) is meant to move like the chair(part/union) but instead it just spins around

does anyone know why?

Local:

runservice.RenderStepped:Connect(function()
	if currentprop ~= nil then
		if currentprop:IsA("Model") then
			currentprop.PrimaryPart.CFrame = character.Head.CFrame+workspace.CurrentCamera.CFrame.LookVector*10
			currentprop.PrimaryPart.Orientation = currentprop.PrimaryPart.Orientation + currentrotation
		else
			currentprop.CFrame = character.Head.CFrame+workspace.CurrentCamera.CFrame.LookVector*10
			currentprop.Orientation = currentprop.Orientation + currentrotation
		end
		updatepropevent:FireServer(currentprop,"Carry",workspace.CurrentCamera.CFrame,currentrotation)
	end
end)

Server:

if action == "Carry" then
		mainpart.CFrame = character.Head.CFrame+cameralook.LookVector*10
		mainpart.Orientation = mainpart.Orientation + rotation
		mainpart.Anchored = true
		if prop:IsA("Model") and not prop:FindFirstChild("col",true) then
			for _,i in pairs(prop:GetDescendants()) do
				if i:IsA("BasePart") then
					local originalcollide = Instance.new("BoolValue")
					originalcollide.Value = i.CanCollide
					originalcollide.Parent = i
					originalcollide.Name = "col"
					local originalquery = Instance.new("BoolValue")
					originalquery.Value = i.CanQuery
					originalquery.Parent = i
					originalquery.Name = "que"
					i.CanCollide = false
					i.CanQuery = false
				end
			end
		elseif prop:IsA("BasePart") and mainpart.CanCollide ~= false then
			mainpart.CanCollide = false
			mainpart.CanQuery = false
		end
	elseif -- yada yada yada unrelated code stuff
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