View difference between Paste ID: <a href="/tPX6bvMw">tPX6bvMw</a> and <a href="/JMHCXfgN">JMHCXfgN</a>

Executing these 2 lines will result in "theElement" getting more and more click event listeners. I dont understand.
1		Executing these 2 lines will result in "theElement" getting more and more click event listeners. I dont understand.
2
3		document.getElementById('theElement').removeEventListener("click", e => whateverComplexFunction(e));
4		document.getElementById('theElement').addEventListener("click", e => whateverComplexFunction(e));