Looks like there is a bug in WP core that leads to target="_blank" being stripped from Author or user Profile Bio and Category Description. Here is the link to this bug: https://core.trac.wordpress.org/ticket/12056

In order to fix this, you need to add the following piece of code to your theme's functions.php file:

	// http://digitizor.com/add-target-blank-author-wp/
	add_filter( 'get_the_author_description', 'amtf_target_blank_author_desc' );
	/**
	* Add target _blank to links in author description
	* Drop-in fix (workaround) for: https://core.trac.wordpress.org/ticket/12056
	*/
	function amtf_target_blank_author_desc( $desc ) {
	return str_replace( '<a', '<a target="_blank" ', $desc );
	}

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