This is happening because you have a password-protected subfolder on your account. If there is a .htaccess file above the subfolder you are trying to password protect, Apache webserver is confused and asks the password for each .htaccess file it finds in its path. In order to solve this, either move the password protection to your web root folder or remove any rewrite rules/redirections.
Find information and articles about features, guides for troubleshooting,
and other useful information related to Hostinger's web hosting services.