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By default, the plain text email template is called registration/password_reset_email.html (which I personally think is confusing as plaintext is not html). In your case both the email_template_name (plaintext) and html_email_template (html email) are using the same template this means if a client cannot use html it will fall back to a plaintext email which contains html syntax.

From the docs:

email_template_name: The full name of a template to use for generating the email with the reset password link. Defaults to registration/password_reset_email.html if not supplied.

html_email_template_name: The full name of a template to use for generating a text/html multipart email with the password reset link. By default, HTML email is not sent.

To resolve this:

1. change the name of the html email template to be: html_password_reset_email.html
2. Update the keyword args in your urls.py setting the html_email_template_name=registration/html_password_reset_email.html,

This will now send the html email template for clients which can render html and fall back to the plaintext (django default) template for clients which can only render plain text.

Additional information: The source for sending password reset email can be found here: https://github.com/django/django/blob/7f612eda80db1c1c8e502aced54c2062080eae46/django/contrib/auth/forms.py#L247

In short, the variable email_template_name is used to send a plain text version of the email. If you include the html_email_template_name, then an additional payload is added to the email; which includes a html email attachment (html_email_template_name).