Help please (Google Docs)

I wouldn't call myself particularly tech savvy, so I have no idea why this is happening, and I'd appreciate any troubleshooting help if available.

Every time I make a new footnote in Google Docs, there is an "F" immediately before the author name. I've tried switching styles as well as downloading a new style from the repository and switching to that, but it persists. There's nothing in the prefix or suffix boxes. It's not a part of the actual citation, I can delete it without the Zotero connector giving me the warning it does if I try to edit a normal citation. This is driving me BATTY.
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