Magento – Strange .htaccess and base URL redirect happening

I have an odd scenario that I cannot figure out. When Auto-redirect to Base URL is set to 301 or 302, the homepage of my website redirects correctly to what I have defined as my base URL (I am using non-www as my base). However, when this is on and I try to visit one of my subpages using the www. version, it sends me back to my homepage.
IE:
www.example.com redirects correctly to example.com
www.example.com/subpage, also sends me to example.com – not the correct subpage.

I thought that I may be able to circumvent this by disabling the base URL redirect and then manually modifying my .htaccess file. I used the following code:

RewriteEngine on 
RewriteCond %{HTTP_HOST} !^example\.com$ [NC] 
RewriteRule ^(.*)$ http://example.com/$1 [R=301,L]

In this case it is a similar situation… when visiting www.example.com I am correctly redirected to example.com. However, when I visit www.example.com/subpageI am incorrectly redirected to example.com/index.php

I found a few variations of the redirect code and all had the same results.

I then tried to manually redirect individual pages, also to no avail.

I also tried setting a manual redirect through the Magento URL Rewrites in the dashboard.

Nothing seems to work and I am out of ideas. Any help or guidance is appreciated.