Why is the "localStorage.removeItem" stopping the loop? If I remove "localStorage.removeItem" and only leave the "alert", it loops though whole thing, but with "localStorage.removeItem" it stops on the first match.

function removeTask() {
    for (i=0; i < localStorage.length; i++){
        checkbox = document.getElementById('utford'+i);
        if (checkbox.checked == true) {
            alert(i);
            localStorage.removeItem(localStorage.key(i));
        }
    }
    printList();
}