I think it was Wordfence just displaying the hidden/custom URL. I changed the admin URLs a few times but if I look at older traffic, they all show whatever the latest custom URL is, which means Wordfence is just displaying wp-login.php as whatever the current URL is, but WP Hide is working as normal. So I think this is a Wordfence issue, and really more of an annoyance since things are working fine.
Thanks for a great plugin.