Citing a reference or inserting a footnote in between or before a sequence has been reported to crash Microsoft Word.
You have 10 footnotes in your document. Citing a new footnote before footnote 1 or in between footnotes 1 and 2 will output a significant number of track changes. In contrast to where you cite an 11th reference where the number of changes the system tracks is much lower.
Our recommendation is that you turn off track changes if you'll need to cite or edit references throughout your document.