Retrieved date cited incorrectly for websites

The date displays correctly in the zotero record, but when I go to create a citation, the date retrieved timestamp is all weird, and even inconsistant. This seems to happen in multiple styles (APA 5th, 6th, NLM, IEEE). See below:

2008 lecture | Past lectures and slides | Lovelace Lecture | Events | Products, Services and Events | BCS - The Chartered Institute for IT. (n.d.). . Retrieved February 1, 2011, from http://www.bcs.org/category/8997
Computer Laboratory – Obituaries: Karen Spärck Jones CV. (n.d.). . Retrieved 22:36:01, from http://www.cl.cam.ac.uk/misc/obituaries/sparck-jones/cv.html
Karen Spärck Jones. (n.d.). . Retrieved 22:39:39, from http://www.cl.cam.ac.uk/archive/ksj21/
Karen Spärck Jones - Wikipedia, the free encyclopedia. (n.d.). . Retrieved 22:06:07, from http://en.wikipedia.org/wiki/Karen_Sp%C3%A4rck_Jones
Karen Spärck Jones | Times Online Obituary. (n.d.). . Retrieved 00:03:56, from http://www.timesonline.co.uk/tol/comment/obituaries/article1968942.ece
Karen Sparck Jones Bio. (n.d.). . Retrieved 22:35:35, from http://www.clsp.jhu.edu/ws99/schedules/ksjbio.html
Karen Sparck Jones Publications. (n.d.). . Retrieved 23:02:46, from http://www.cl.cam.ac.uk/archive/ksj21/ksjdigipapers/ksjbib3.html
reprint of 1972 article. (n.d.). .
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