Codes or random letters added to citations?

After updating a manuscript to CMOS 18, some of my citations had "mystery" letters added: either "rfh" or "yah." Do these have a meaning? The only way to get rid of them seems to be manual deletion in the very last editing, since they reappear with refreshing.
  • Do you have anything in your extra field for those items?
  • Ahah. I see that these letters come from the "Archive" field. That was never included in citations before. Now I know that I can delete them from there! Thanks.
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