Hi … You’ve not missed anything in the plugin’s setup, but this is documented in the plugin’s FAQs, specifically FAQ number 6, which says …
I’ve installed and configured WP Biographia and now I see not one but two differing Biography Boxes; what’s going on?
There’s probably one of two things going on here. Firstly, you’ve already got another plugin that makes a Biography Box installed and active and this plugin, as well as WP Biographia, are doing their job properly. Secondly, the theme you’re using hard codes a Biography Box into the theme templates. Both the TwentyTen and TwentyEleven themes supplied as part of a standard WordPress install do this.
From looking at the page source for the link you mentioned in your post, I can see that the first Biography Box on the page is produced by WP Biographia as it’s prefixed by an HTML comment that the plugin emits
<!-- WP Biographia v3.3.0 -->
The second Biography Box appears to be hard coded into your theme’s templates and is inside a div with a class of about-author.
A workaround would either be to edit your theme’s templates to remove this second div or to add some custom CSS to set display: none for the about-author class.
I can also see from the page source that you’re using the Nevia theme from ThemeForest. As this is a premium theme, there’s not much else I can do to help as I can’t get access to the theme’s template source code to look further; I’d recommend you contact ThemeForest support or the theme’s author to help you with this.
-Gary
