Invalid CSRF token or invalid Django

I ran into this problem before and solved it, but it just showed up by accident (or so it seems). I just came back to my Django project after a little time away ... on login I forgot my internet username and gave me the corresponding error message Sorry, that not a valid username or password

. So to solve this problem, I created a new superuser (since I also forgot the admin username) so I could check what my internet username is. I did it successfully, but now when I try to login, I get a CSRF error (is the username or password correct). I have no idea how this happened since it was checked correctly 10 seconds ago and I haven't changed a single line of code.

{% extends "base.html" %}

{% block content %}

    <title>{% block title %} | Login{% endblock %}</title>

    <h2>Login</h2>

    {% if form.errors %}
        <p class="error">Sorry, thats not a valid username or password</p>
    {% endif %}

    <form action="/accounts/auth/" method="POST">{% csrf_token %}
        <label for="username">Username: </label>
        <br>
        <input type="text" name="username" value="" id="username">
        <br><br>
        <label for="password">Password: </label>
        <br>
        <input type="password" name="password" value="" id="password">
        <br><br>
        <input type="submit" value="Login">
    </form>

{% endblock content %}