PrismaticConstraint not moving on 1 axis

[Violet_sheer (TheOtherSider)]

I’m using a PrismaticConstraint for a moving part in an obstacle course but the prismatic constraint is moving on the x and z axis and I’m not sure why.

In the video I tested the prismatic constraint with test parts and the real obstacle course to show that it wasn’t working as intended.

Code for moving parts

Obstacles["Moving"] = function(comp)
	local timer = comp:GetAttribute("Time")
	local weight = comp:GetAttribute("Weight")
	
	local move = comp.Move

	local function physics(part)
		if part:IsA("BasePart") then
			part.Massless = true
			part.CustomPhysicalProperties = PhysicalProperties.new(weight,0.3,0.4,1,1)
		end
	end
	
	local function getPrimaryPart()
		local prismOriginPart
		if move:IsA("Model") then
			for _,part in move:GetChildren() do
				physics(part)
			end
			prismOriginPart = move.PrimaryPart
		else move:IsA("BasePart")
			prismOriginPart = move
			physics(move)
		end
		return prismOriginPart
	end
	
	local prismOriginPart = getPrimaryPart()
	
	local prism,a0,a1 = Constraints.Prismatic(prismOriginPart,comp.Goals["1"])
	while true do
		for i = 1,#comp.Goals:GetChildren() do
			local targetGoal = comp.Goals:FindFirstChild(tostring(i))
			a1.Parent = targetGoal
			prism.TargetPosition = (targetGoal.Position - a1.WorldPosition).Magnitude
			task.wait(timer)
		end
	end
end

[Violet_sheer (TheOtherSider)]

I used an AlignPosition instead.