在使用管理员账号登录之后，能够进入主页面，但是用户名仍然是bobby, 刷新之后就会出现下面的错误，并没有像视频中一样可以依然保持登录状态

禁止访问 (403)
CSRF验证失败. 相应中断.

报错信息：
Help
Reason given for failure:

CSRF token missing or incorrect.

In general, this can occur when there is a genuine Cross Site Request Forgery, or when Django’s CSRF mechanism has not been used correctly. For POST forms, you need to ensure:

Your browser is accepting cookies.
The view function passes a request to the template’s render method.
In the template, there is a {% csrf_token %} template tag inside each POST form that targets an internal URL.
If you are not using CsrfViewMiddleware, then you must use csrf_protect on any views that use the csrf_token template tag, as well as those that accept the POST data.
You’re seeing the help section of this page because you have DEBUG = True in your Django settings file. Change that to False, and only the initial error message will be displayed.

You can customize this page using the CSRF_FAILURE_VIEW setting.

请问这是什么原因呢？
已经在form中添加了{% csrt_token %}