Hi,
I'm currently wrapping up a manuscript for submission and I found that when I tried to add a new citation in the word document using Endnote plugin or change the bibliography, my entire reference section is messed up. Basically, I have 50 citations in total and after any such changes, the number drops to 20 with many citations just disappear, along with the superscript number in the main text.
I tried to reinsert the disappeared citations again but they just do not show up. I open the "Edit & Manage Citations" tool and I can clearly see instances like there are five citations at the same location but only two are numbered and actually showing up in the reference section. In another word, these citations are still there, but they are just now hidden from the reference section and the superscript numbering, and cannot be re-added.
I uploaded a screenshot example and I really don't know what to do now. For some context, I am writing in ACS template with provided styles. But I'm not sure that is the problem and I have never encountered before. I have changed three computers and the issue persists.
Please help. Thank you.