Help with OO multiple source references

I have several related questions about multiple source citations in OO.

1) I was trying to edit a typo in an author's name and now I am getting a "citation no longer exists" error. However, as it is a large set of citations, I can't determine which one I have accidentally scrambled. Suggestions?

2) I prefer numbered footnotes, but sometimes when I use multiple sources I get numbering like, 5,6,8-10, 11, 13-15 or other manglings. Any suggestions?

Thanks,

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