"Coming soon" page title

I created my website with Joomla via FTP. The page titles all work fine, but when i share my jpteixeira.altervista.org it shows "Coming soon" on the title when I share it on Facebook. The title appears as intended if I share jpteixeira.altervista.org/index.php. I also deleted the original index.html. What am I doing wrong?

It's been a week, and still no replies. Is this such an issue?

You should delete the default index.html file