Hi Tim
Your last question got me thinking. So I temporarily changed the theme from the twenteleven child theme to the twenteleven theme, then to the twentythirteen theme, and finally to the twentyfourteen theme. Each time I changed the theme I checked the logs both before and after going to the Wordfence scan page.
In each case before there is one log record to wp-admin/admin-ajax.php and one to wp-content/plugins/link-library/stylesheettemplate.css followed by silence
In each case while on the Wordfence scan page the wp-admin/admin-ajax.php and the wp-content/plugins/link-library/stylesheettemplate.css are fire off continually.
My guess is it is something to do with the link-library plugin.