Problem with Obby map generation

I’m currently working on a personal project that involves generating a random map in a specific direction, I’m currently running into some positioning issues when adding pieces.

This is the code I have so far:

local function getRandomMapPiece()
	local new = MapPartStorage:GetChildren()[math.random(1,#MapPartStorage:GetChildren())]:Clone()
	return new.Name:sub(1,1) ~= "!" and new or getRandomMapPiece()
end
local function isMapPart(part: instance): boolean
	return part and part:IsA("Model") and part.Name:sub(1,1) ~= "_" and true or false
end
local function getMapDistance()
	local size = 0
	for _,mapPart in pairs(MapFolder:GetChildren()) do
		if not isMapPart(mapPart) then
			continue
		end
		size += mapPart.PrimaryPart.Size.Z
	end
	return size
end


function generator:GenerateMap(distance)
	self:ClearMap()
	for i = 1,(distance and typeof(distance) == "number" and distance or 5) do
		local newPiece = getRandomMapPiece()
		local pieceSize = newPiece.PrimaryPart.Size.Z
		local mapDistance = getMapDistance()
		local newDistance = mapDistance + pieceSize
		
		newPiece.Parent = MapFolder
		newPiece:PivotTo(basePart.PrimaryPart.CFrame * CFrame.new(0,0,-newDistance))
--[[	-- debug
		newPiece.PrimaryPart.BrickColor = BrickColor.Random()	]]
	end
	self:AddPiece("!End")
	return MapFolder
end

This creates this result,


A gap at the start and it goes through the end piece (it should be lining up correctly). I’m not sure if I’m missing something but I can’t seem to figure it out. Any help is much appreciated. Thanks

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