why does zotero refs suddenly unlink and showing red in Google docs

why does zotero links suddenly go unlink and showing red in Google docs
I have zotero desktop Linux installed using chrome OS with zotero link grab all updated and running so I don't know why refs become unlinked at bottom of each page as footnotes and go red for no reason
I'm using Oscola ref style see setting screen grabs attached
https://s3.amazonaws.com/zotero.org/images/forums/u16927334/g6w48nbelhidpfqhpjlf.png
any help much appreciated to save me relinking 3 pages of refs
here is error report
https://s3.amazonaws.com/zotero.org/images/forums/u16927334/ebntqeymeks7155cucv0.png
thanks again
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