Filament login not working in staging/production

I'm setting up my site on a linux staging server, but filament is not working as expected. Whenever I try to login, not only the password is not hashed (it shows as plain text) but i get this error The POST method is not supported for route admin/login. Supported methods: GET, HEAD. I really don't know what to do, I read all the articles I've found and threds too- my network tab is not showing missin assets, like livewire, wich works on other parts of the website, ( but not hashed password makes me think otherwise); the only error showing up in devTools is Uncaught SyntaxError: Unexpected token '<' on the in source tab - no idea why. Please help- Thanks in advance.