[Django]-Occasionally, Django messages are repeated across requests (i.e., they are not cleared)

It seems this a noted problem caused by caching in Django. Here is the comment made by one Django core developer:

“I don’t think Django can handle this problem automatically and correctly.
It is a very common pattern to loop over messages in the base template of a website. If we disable caching simply because messages might be displayed on a given page, we’re just killing the cache for most websites.”

The full ticket is here: https://code.djangoproject.com/ticket/13894