Hi Paul,
I got the login info from this ticket: #ZWZ-532798
This issue relates to the menu assignment only, not SEO part, as by default in Joomla, when you click a link, it will redirect to the menu item page that the destination page belongs to.
When you click the reset password link, it will find the menu item for this type in Joomla but there was not this menu item type on your site so it displayed on homepage as you can see in the link: http://[websitename]/index.php?option=com_users&view=remind&Itemid=101 -- Itemid=101 here is the ID of homepage.
I just created a new menu item call 'Password Reset' under 'Author menu' on your site, it should redirect to this menu item page now.
Kindly check and let me know if you need further help.