I was reading a novel today. It prompted me to log in again. After logging in, everything was gone. What was going on?

It could be that there was some technical problem with the website that caused the login to fail, but it did not mean that everything was lost. If the login was successful but everything was deleted, it might be because the website encountered some internal error that caused the system to crash. This may require waiting for the website to be repaired and all the content to be reloaded before it can return to normal. If the website does not give any error messages or recovery measures, you can try to log in again and see if there are any updates or error messages. You can also try contacting the website administrator or technical support for more help.