1. When you have hitboxes and Fabulous Graphics enabled you cannot see hitboxes in the GUI (I showed this in the video). However, if you have Fast or Fancy Graphics enabled, you can see hitboxes in the GUI.
2. Also, if you look more closely, the hitbox lines in the normal world are located correctly, but for some reason they are shifted in the gui.
3. In addition to the fact that the lines are not symmetrical, they are also visible through the player model in the graphical interface

How it should works?
just turn them off. I don’t understand why they are needed in the gui.