Broken lines under footnotes

Hello, a student I'm working with has asked me to find out why he is getting broken lines under some of the footnotes he has inserted using Zotero. I've some experience of using Zotero, but have not come across this before. I've checked the properties of the field in the example he sent me, and it comes up with:

ADDIN ZOTERO_ITEM CSL_CITATION {"citationID":"kRuOTQ0g","properties":{"formattedCitation":"\\uldash{Jean-Marie Henckaerts and Louise Doswald-Beck, {\\i{}Customary International Humanitarian Law. Volume I: Rules}, vol I (ICRC and Cambridge University Press 2009).}","plainCitation":"Jean-Marie Henckaerts and Louise Doswald-Beck, Customary International Humanitarian Law. Volume I: Rules, vol I (ICRC and Cambridge University Press 2009).","noteIndex":5},"citationItems":[{"id":211,"uris":["http://zotero.org/us

I'm afraid I don't know how to interpret this, but is there a clue here? Can anyone else help?

Many thanks,
Frith Hooton
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