Links to citations change..!?

I am working on my masters thesis and have noticed that the links to citations have changed just recently ie where I had (Smith, 2004) I now have (Jones, 2006).
Both are in my Zotero list, however it appears that the link between OOo and Zotero has altered in some manner. The citations have been shifted by one position when sorting the title of the reference in alphabetical order ie Smith 2004 title is 'A Fat Black Cat' and Jones 2006 title is 'A Fat Brown Cat'.

Have others experienced this?
Why would it occur, considering every reference should be uniquely referenced?
How do I rectify the situation as I don't want to go back through and re-insert the correct citations (many hundreds in my thesis)?

Hope everyone enjoyed the Easter break :-)

Craig
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