@anoshnea Hi please reach out to your hosting provider accuwebhosting.
https://anoshnea.com/wp-config.php
If you right click and do a view page source you will notice that your entire wp-config file is displayed along with all your database login credentials which is a significant security threat. What is happening here is that the PHP files are being delivered as text files, which means the PHP interpreter is not executed most probably on the server side.
The last thing that I can suggest is creating an empty file with the following code content <?php phpinfo(); ?>
The output might provide some clues.
You should ask your hosting provider to fix this for you immediately, and once this is fixed kindly update your database login credentials which are displayed in wp-config.php.