The Hierarchy of the Composite Module goes left to right (top/front to bottom/back). Looking at the Network Window both Phil MOUTH and eyeball are inserted into the 2nd and 3rd slots from the left side of the Composite Module.
There are 12 slots but only 9 items visible in the Timeline of this image. I imagine the red square is the drawing layer labled “Drawing” inserted in #1?
I would expect to see evidence in the Camera View that the mouth is in front of the pupil while the pupil would come next. Are you sure the mouth is not in front of the pupil? The edge of the red square could be right at the edge of the mouth so I cannot tell.
What are the Z coordinates of the red square, Phil MOUTH and eyeball?
Did you only draw one pupil (the character’s left eye) or does “eyeball” contain both the character’s right and left pupils or are both pupils always on top of everything?
Something else to verify is that each drawing layer contains what it should and that somehow an item did not end up misplaced on the wrong layer consequently leading you to believe it is on a specific drawing layer.
Try unplugging “eyeball” from the 3rd slot and moving it to one of the last positions of the Composite Module (our right side). If that works logically, you will eventually want “eyeball” somewhere to the left side of “EYES” of course.