OnTriggerExit is not calling

Howdy… I am attaching a box collider with a rigidbody on it with it being kinematic and gravity turned off. When ever it enters something, OnTriggerEnter and OnTriggerStay both work perfectly. However, OnTriggerExit never works. What could this be? Thanks!

The proper code for OnTriggerExit is:

void OnTriggerExit (Collider collider){
    //Your code here

Or in Unityscript /JavaScript

function OnTriggerExit(Collider collider){