{% load threadedcomments_tags i18n %}
{% for comment in comment_list|fill_tree|annotate_tree %}
    {% if not comment.open %}
        </div></div>
    {% endif %}
    <div class="media">
        <div class="media-body" id="c{{ comment.id }}">
            <strong class="media-heading">
                {% if comment.user_id %}
                    <a href="{% url 'user' comment.user.username %}">{{ comment.user.userprofile }}</a>
                {% else %}
                    {{ comment.user_name }}
                {% endif %}
            </strong><br>
            <div class="user-text">{{ comment.comment }}</div>
            <div class="media-footer"><small>
                <span data-toggle="tooltip" data-placement="bottom" title="{{ comment.submit_date }}">{{ comment.submit_date|timesince }} назад</span>
                | <a href="#" data-comment-id="{{ comment.id }}" class="link-reply link-dotted">Ответить</a>
            </small></div>
    {% for close in comment.close %}
        </div></div>
    {% endfor %}
{% endfor %}

{% load threadedcomments_tags i18n %}
{% for comment in comment_list|fill_tree|annotate_tree %}
    {% if not comment.open %}
        </div>
    {% endif %}
    <div class="media">
        <div class="media-body" id="c{{ comment.id }}">
            <strong class="media-heading">
                {% if comment.user_id %}
                    <a href="{% url 'user' comment.user.username %}">{{ comment.user.userprofile }}</a>
                {% else %}
                    {{ comment.user_name }}
                {% endif %}
            </strong><br>
            <div class="user-text">{{ comment.comment }}</div>
            <div class="media-footer"><small>
                <span data-toggle="tooltip" data-placement="bottom" title="{{ comment.submit_date }}">{{ comment.submit_date|timesince }} назад</span>
                | <a href="#" data-comment-id="{{ comment.id }}" class="link-reply link-dotted">Ответить</a>
            </small></div>
        </div>
    {% for close in comment.close %}
        </div>
    {% endfor %}
{% endfor %}

Include next comment in .media, not in .media-body
Include next comment in .media, not in .media-body
