Nature Superscript Numbering Issue

I've exported a file in .odf format from Scrivener, run the ODF Scan and applied the Nature style. However, some of the superscript numbers are differently sized. See:
https://imgur.com/43qFAXu
https://imgur.com/kRWrdSg
https://imgur.com/fzGzNRX

Can anybody explain what's happening and what can be done about it?
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