How do I make it so model contents don't dissapear? [SOLVED BY ME]

Here is my code:

function generateMap()
	-- The map is named "A" so I can see it first thing.
	
	-- Get Rid of last map in "Map" Model.
	workspace.A:ClearAllChildren()
	
	-- Generate the biome
	local y
	local x
	
	-- We have a start and it's easier to keep track of it in a variable.
	local startOfMap = Vector3.new(-144.5, 0.5, 87.5)
	
	-- Start the loop for generating the biome.
	for y=1, 10 do
		for x=1, 10 do
			local part = Instance.new("Part")
			part.Parent = workspace.A
			local Y = -144.5 + (x * 25)
			local X = 87.5 + (y * 25)
			part.Size = Vector3.new(25, 1, 25)
			part.Position = Vector3.new(X, 0.5, Y)
			part.Material = "Grass"
			part.Color = Color3.new(0, 255, 0)
			part.Anchored = true
		end
	end
end

generateMap()

If there is something I can do, please say so. I've been struggling to find an answer. After a few seconds, it disappears.