Ok, I figured it out. In Apaches httpd.conf file, where I have the VirtualHost setup for kathykendall.net, I had set the ServerName to kathykendall.net, and set ServerAlias to www.kathykendall.net. I have been using setups like that on all my web sites and have never seen anything redirect like that before until now. Whodda thunk it. Anyways, I swapped the ServerName and ServerAlias around and it is working.
I am not sure how PunBB is seeing the difference and redirecting, but that is the only place on the site that does redirect like that, so I am sure it is something that PunBB is doing, just fyi.