Hosting WP multisite alongside non-WP sites

I am having a configuration issue which is holding up a site launch.

I host a number of sites on WP multisite running on Apache with mod_php. Those sites work.

However I am also trying to launch a site that doesn't use WP on the same web server, and I am having a problem with it. My domain is registered and the DNS info has been propagated. But now when I try to reach the new domain, it gets redirected to the "main" site of with the url "[WPdomain.com]/wp-signup.php?new=[nonWPdomain.com]".

I'm pretty sure this is caused by some kind of redirect that was implemented for WP Multisite, but I set this server up a long time ago and don't remember doing anything manually for the rewrite rules.

Could someone give me a hint as to what I should be changing?

 

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