Reference number in the document is not starting with 1

I am writing a long thesis and suddenly EndNote mixed  reference order: it does not start it with the number 1 but instead with 3. And what it count as a number 1 is actually a reference number 11. I saw the post how to solve the problem when one has references under the figures (so the endnote prioritize it) but the fact is that I don’t. 
Does someone know how to solve that problem?
Thank you in advance! :slight_smile: