are the hostingers records all useless that comes by default? so do i need to delete it all?

Error 520 is essentially a catch-all response when something unexpected happens or when the origin server incorrectly interprets or does not tolerate a request due to a protocol violation or an empty response. A 520 error occurs when the connection started on the origin web server, but that the request was not completed. The most common reason why this would occur is that either a program, cron job, or resource is taking up more resources than it should causing the server not to be able to respond to all requests properly. When this happens, you’ll see “Error 520: Web server is returning an unknown error”.

do you think could be a problem in the backend code

maybe i need to buy a total tls idk