"home.aspx" being added to WordPress home URL

I’ve rebuilt a client’s Sitefinity site in WordPress. The interior pages display fine, but when entering the WordPress site url, i.e., “familypromisejax.org”, it changes to “familypromisejax.org/home.aspx” — and of course I get a 404 error because there’s no such page.

The old site is hosted elsewhere. The new one is on BlueHost. How is the “home.aspx” extension being added to the URL, and how can I stop it from appearing?

Thanks for any advice.