Because the airmeter looks like the part of the HUD (Heads Up Display or status bar), sprites goes on top (or on front) of this makes this looks weird
Its also weird when the ovelap glitch with the pirhana plant inside the pipe too, because the airmeter goes behind most sprites and on front of layer 1. The airmeter is on front of the pipe and behind the pirhana plant at the same time.
most HUD on screen in games always be on front of everything in perspective, otherwise sprites can "block" the viewing on on it
Give thanks to RPG hacker for working on Asar.