for field in form:
# render form
if len(form):
# <p>Все данные уже добавлены</p>
symbol = forms.ChoiceField(widget=Select2Widget, choices=MY_CHOICES)
<div class="comment-blocks">
{% for task in tasks %}
...
{% endfor %}
</div>
$('.comment-blocks').on('submit', '.task-comment-form', function(event) {
//Остальной код
});
$(".task-comment-form").submit(function(event) {
Поменять на
$('.wrapper-custom-list-group').on('submit', '.task-comment-form', function(event) {
<div class="list-group custom-list-group">