Combined document "n" notes incorrect

I've recently combined 6 separate docs (chapters) - the footnote numbers begin at 1 at the start of each chapter. The problem is that the (n) numbers within a reference refer to the relevant footnote as if each chapter's footnotes ran together.

So, for example, my last footnote in chapter 5 might say something like this:

73 Smith, 'The Wealth of Nations' (n1163).

Instead of:

73 Smith, 'The Wealth of Nations' (n46).

Can anyone help please???
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