Hi John,
I checked the URL you sent me. You do have duplicate pages:
http://www.madebysurvivors.com/destiny
http://www.madebysurvivors.com/DESTINY
both work and return the same page..
I also tried clicking on other links on your site, and then just changing a few letters to the upper case something like this
http://www.madebysurvivors.com/LEArn-human-trafficking-slavery
and it returns the same page
From what I can tell its one of the features in Magento that is making this possible. I would go into settings and disable that setting that forces Magento to use lower case.
Then test it make sure that you DO get a 404 page if you change the letter case on any of your links. Once you test it and you do get a 404 page.
I'm not familiar with Magento so not sure if it has that option or not, but many CMS and ecommerce platforms have a field where you can specify the URL for that page, I would change that field to all lower case.
Test it again, if it works there is one more step that you have to do if you want to keep the same juice from the pages that had the uppercase URL.
You need to duplicate your pages, but you need to make sure that the URL address is the same as it was before (in all CAPS) and then do a 301 redirect to the new page which is in lower case.
Hope this helps and makes sense.