OnTriggerEnter being called multiple times

I have a an object with a Sphere Collider attached to it with the IsTrigger boolean checked

I have a function that is as follows

 private void OnTriggerEnter(Collider other)
 {
           Debug.Log(other.transform.name);
 }

At the beginning, this works normally. When other objects enter the Trigger Collider, the name is output to the console window. However, after a few seconds, it begins repeatedly calling the OnTriggerEnter function. I have tested this again changing the collider to a BoxCollider but it still happens. Why is this happening?

Note: I understand that I could use a sentinel value to solve this, and I plan on implementing that. However, I want to understand why this happens to begin with.