Gaps and overlaps between platforms in the infinite runner

I am making 3d runner game. Every certain period of time I instantiate 5 floor pieces which are in the single prefab and has the same material. I don't have any gaps between them but when I run it in the playmode and they move towards the player, I can see gaps and overlaps. I use a simple script to move them: transform.Translate(moveSpeed * Time.deltaTime);