In a few machines i tryed..its the first time i use this mod so i would appriciate to be fixed
i am using this TechReborn-1.12.1-2.7.2.233-universal for MC 1.12.1

Not reproducible. Some multiblock machines expected to be on top of multiblock. Thus if you place them on ground multiblock hologram will be below them. You can check how to build multiblock on wiki: https://wiki.techreborn.ovh/doku.php?id=blocks