Just one site is doing this:

Correct URL should be https://www.pooltablefeltcloth.com/leveling-setup-supplies/category/wedges-shims.html

But in both the HTML and XML it is stripping the domain name: https://www./leveling-setup-supplies/category/wedges-shims.html

I've tried setting "Custom sitemap domain" to "https://www.pooltablefeltcloth.com".
No good.

But if I set the custom sitemap domain to anything else (e.g. https://www.allpool.net) it works fine.

I have other sites on the same server and similar configurations with sh404sef and HikaShop and they all work fine.

I've using version 3.3 on Joomla 3.4.1.
I've tried disabling sh404sef, setting the configuration.php live_site value, and disabling the https rewrite rules.

Something it causing it to parse out the domain name of the site but I cannot figure out why. XMap didn't have this problem when I was running it (before Joomla 3.4 upgrade).

Any ideas?