Script doesn't work as intended? tracer recall*

Does anyone know why this happens? Please try it in a new place. I don't know whats wrong. Whenever it reaches 60 it is supposed to teleport me back to my last location but the thing that happens is that my character goes through the floor and the camera goes up a lot.

local UserInputService = game:GetService("UserInputService")
local CanSetPos = script.CanSetPo
local player = game.Players.LocalPlayer
local hum = player.Character.HumanoidRootPart
local Positions = {
	
	
	
	
	
	}

function TrackPos(key)
	if key.KeyCode == Enum.KeyCode.E then
	
		if table.getn(Positions) == 60 then
		hum.Position=Vector3.new(Positions[25],Positions[26],Positions[27])
		
		
		
		
		else print("not 27, it is:"..table.getn(Positions))
		
		end
	end
end



UserInputService.InputBegan:connect(TrackPos)










-- getting positions

while wait(0.2) do
	if table.getn(Positions) == 60 then
		
		local currentpos = player.Character.HumanoidRootPart.Position
		local x = currentpos.x
		local y = currentpos.y
		local z = currentpos.z
		
		table.remove(Positions,1)	table.remove(Positions,2)	table.remove(Positions,3)
		
		table.insert(Positions,x)   table.insert(Positions,y+10)   table.insert(Positions,z)
		
	
	
	else
		local currentpos = player.Character.HumanoidRootPart.Position
		local x = currentpos.x
		local y = currentpos.y
		local z = currentpos.z
			table.insert(Positions,x) table.insert(Positions,y) table.insert(Positions,z)
			
			
	
	end
end

The CanSetPos is a boolvalue set to true that is located under the script.