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I think that the main problem is that you are including <div class"accordion" id="accordionExample"> inside the loop. A secondary one is that the "collapse" class is also necessary for the first iteration. Try this:
<div class="accordion" id="accordionExample">
{% for category in top_categories %}
<div class="accordion-item">
<h2 class="accordion-header" id="heading{{category.id}}">
<button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#collapse{{category.id}}" aria-expanded="true" aria-controls="collapse{{category.id}}">
{{category.title}}
</button>
</h2>
<div id="collapse{{category.id}}" class="accordion-collapse collapse {% if forloop.first %}show{% endif %}" aria-labelledby="heading{{category.id}}" data-bs-parent="#accordionExample">
<div class="accordion-body">
{% for qa in category.qa.all|slice:"0:3" %}
<a href="{{ qa.get_absolute_url }}">Q: {{qa}}</a><hr>
{% endfor %}
</div>
</div>
</div>
{% endfor %}
</div>
๐คLaCharcaSoftware
Source:stackexchange.com