Citation numbered differently when listed alone vs with adjacent refs

I have 3 refs and 2 sentences that look essentially like this:

Sentence 1: Text text text {Ref A;Ref B;Ref C}.

Sentence 2: Text text text {Ref C}.

When I format/update citations, Refs A and B format just fine and are assigned their appropriate citation numbers (“7” and “18”, respectively), but Ref C is assigned citation number “16” when it’s all by itself in Sentence 2 but “116” when it’s adjacent to the others in Sentence 1. When I break apart the group of citations in Sentence 1 (ie, Text text text {Ref A} {Ref B} {Ref C}), then Ref C formats to its correct “16” but as soon as I link the 3 refs back together with semicolons inside the brackets, it goes back to “116”.

To fix this, I have tried (1) to clean up the field codes, (2) to delete Ref C from my library (it had been pulled off PubMed) and recreate it manually, (3) to switch around the order of Refs A, B, and C prior to formatting, (4) to view the field codes in my Word doc then delete everything having to do with the citations at the end of Sentence 1 and reinsert them (individually or as a batch), but nothing has worked and I am absolutely stumped!

Has anyone else encountered this problem and/or know how to fix it?!

I’m using the style for the journal Neuroepidemiology, downloaded from EndNote’s style library. And no, it doesn’t happen with other numbered styles (eg, Vancouver). I also just realized that in my comment above, when I said that reference “18” was fine, I was incorrect. It actually should be reference “8” but an additional digit got added to this one, too.

Downloaded the style again and problem is now fixed. I will touch base again if it recurs. Somehow the style must have gotten corrupted. Thanks!