Some trackers selected to be blocked are not blocked in Safari

In the last few days I've noticed that some items (such as Gigya Socialize, NetShelter and VigLink, Facebook Social Plugins and New Relic) despite being checked to be blocked in the Ghostery menu that appears when the Ghostery icon in Safari is selected, do not have a cross-out line going through them like the other checked items. Furthermore the list that automatically appears when a new web page is loaded highlights them as being active. Could you please tell me why they aren't being blocked and what I can do to block them? Thanks.
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