OnCollisionExit() firing when object has not exited

I have two sprites, a Player and an NPC. When the player enters the NPC's BoxCollider, a story starts. When the player exits the NPC's BoxCollider, I want the text to fade out.

The issue I'm having is that after selecting a choice in the story, the text fades (effectively doing what's in OnCollisionExit2D). The Player has not exited the NPC's BoxCollider, but the OnCollisionExit2D is firing. What am I doing wrong?

Here's a snippet from the NPC script:

     void OnCollisionEnter2D(Collision2D other)
     {
         if(other.gameObject.tag == "Player" && GameMaster.GM.politeness==0)
         {
             StartStory();
             isColliding = true;
         }
     }
 
     void OnCollisionExit2D(Collision2D other)
     {
         if(other.gameObject.tag == "Player")
         {
            FadeText(2);
             //GetComponentInChildren<Canvas>().enabled = false;
             isColliding = false;
         }
     }
 
     void FadeText(int fadeTime)
     {
         foreach (Text txt in GetComponentsInChildren<Text>())
         {
             txt.CrossFadeAlpha(0, fadeTime, false);
         }
     }
 

And here's a link to a video of it happening in action: OnCollisionExitMystery