Path course maker making 2 courses instead of one.. Why?

So! Im trying to make a tower defence game where bots smothly move across the track using bezier curves.. however.. this happens..

http://prntscr.com/l7bom5

It creates 2 tracks for some reason and the enemys go on the track witch does not curve.. Why i this?

Here is my scripts that control this!

Script 1:

-- Starts the track and makes the course.
local lod = 105

local course = require(game.ReplicatedStorage.Modules.OtherStuff.Course)

local events = game.ReplicatedStorage.Events
local signal = events:WaitForChild("Signal")

local nodes = course:spawnNodes(workspace.Course,lod)

Script 2:

-- Spawns nodes into the game.
function course:spawnNodes(t,l)
    local bezier = require(game.ReplicatedStorage.Modules.OtherStuff.Bezier)
    local nodes = {}
    for _,n in pairs(t.Paths:GetChildren()) do
        nodes[tonumber(n.Name)] = n
    end
    for i,n in pairs(nodes) do
        if nodes[i+1] and nodes[i+2] and (tonumber(n.Name)) ~= 0 then
            local pda = Vector3.new(0,game.ReplicatedStorage.Assets.Enemies.Regular.Position.Y-n.Position.Y,0)
            local z,z1,z2 = n.Position+pda,nodes[i+1].Position+pda,nodes[i+2].Position+pda
            nodes[i]=bezier:curve(z,z1,z2,l,true,n) -- This creates the curve.
        end
    end
    return nodes
end

Bezier Script

-- Somehow this get run twice and creates two lines and the bot does not go on the right track.
local bezier = {__type="Bezier"}

function GetCorners(part)
    local corners = {}
    for x= -1,1,2 do
        for y= -1,1,2 do
            for z= -1,1,2 do
                corners[#corners+1] = part.CFrame:pointToWorldSpace(Vector3.new(part.Size.X/2*x,part.Size.Y/2*y,part.Size.Z/2*z))
            end
        end
    end
    return corners
end

function getTopCorner(p)
    local c = GetCorners(p)
    local tc = CFrame.new((c[3].x+c[8].x)/2,(c[3].y+c[8].y)/2,(c[3].z+c[8].z)/2)*CFrame.Angles(math.rad(p.Rotation.X),math.rad(p.Rotation.Y),math.rad(p.Rotation.Z))
    return c,tc
end

function line3D(o,o2,n,p)
    local surfaces = {
        "BackSurface",
        "FrontSurface",
        "RightSurface",
        "LeftSurface",
        "TopSurface",
        "BottomSurface"
    }
    local mag = (o-o2).magnitude
    local l = Instance.new("Part")
    if n then
        l.Name = n
    else
        l.Name = "Line3D"
    end
    l.Material = Enum.Material.DiamondPlate
    l.BrickColor = BrickColor.new("Bright green")
    l.Anchored = true
    l.Locked = true
    l.Size = Vector3.new(0.3,0.3,mag)
    l.CFrame = CFrame.new(o,o2)*CFrame.new(0,0,-mag/2)
    for n,d in pairs(surfaces) do
        l[d] = Enum.SurfaceType.SmoothNoOutlines
    end
    l.Parent = p
    return l
end

function bezier:curve(x,y,z,l,d,pa)
    local lastPoint
    local points = {}
    for t= 0,1,1/l do
        local p = (1-t)^2*x+2*(1-t)*t*y+t^2*z
        if (lastPoint and d~= false)then
            local v = line3D(lastPoint,p,"line",pa)
            local c,tc = getTopCorner(v)
            points[#points+1] = tc
        elseif lastPoint and not d then
            local v = line3D(lastPoint,p,"line",pa)
            local c,tc = getTopCorner(v)
            v:Destroy()
            points[#points+1] = tc
        end
        lastPoint=p
    end
    return points
end

return bezier

Bot Script:

-- Controls the enemies.
local self = {}
local ai = {}

function self:StartEnemy(source, enemy, bl)
    local stats = require(game.ReplicatedStorage.Modules.Types.EnemyStats)

    stats = stats[enemy]
    local st = {paused=false,destroyed=false,body=nil}

    local obj = game.ReplicatedStorage.Assets.Enemies[enemy]:Clone()
    obj.CFrame = bl.Parent.Other:WaitForChild("StartPath").CFrame
    obj.Parent = bl
    st.body = obj
    ai[obj] = st


    spawn(function()    
        for i=1,#source,1 do
            if i%2 ~= 0 and ai[obj] ~= nil and not source[i].ClassName then
                for n,v in pairs(source[i]) do
                    if ai[obj] ~= nil then
                        local scf = obj.CFrame
                        for j=0,1,stats.Speed*0.005 do
                            obj.CFrame = scf:lerp(v,j)
                            wait(0.01)  
                        end
                    end
                end
            else
                break
            end
        end
    end)
end

function self:EndLife(enemy)
    ai[enemy].destroyed = true
    ai[enemy].body:Destroy()
    ai[enemy] = nil

end

return self

Start Script:

-- This starts the bot.
enemyai:StartEnemy(nodes, "Regular", workspace.Course.Enemies)

I have sat trying to fix this for 4 hours.. I have no idea whats wrong with it. If you know whats wrong please let me know! Thanks!