Posts duplicating after scroll

Once the posts in my category have all loaded it starts to repeat from the beginning again. If you watch the alphabet and steampunk book reviews and scroll down for couple of pages my last book reviews should be Curious Critters and Seeing Symmetry.
However, once you get to those last books, the posts begin again with the alphabet and steampunk book reviews duplicating what I already have on the page.
http://brainpowerboy.com/category/books-boys-parents/boys-books-fiction-non-fiction/

I tried uninstalling plugins but nothing I have tried works to fix the issue. It is happening on other categories as well.

Thanks,
Sheila