Continue editing a document that has already been worked on

I am desperately looking for help.
My problem is that in a document that I have already started to edit, I cannot continue editing with Zotero after saving and closing it. More precisely:
My citations and reference list go up to number 63. If I now want to add another citation, which according to the alphabet should be at 26, this is simply inserted into the text as citation number 1 and the existing reference list is not supplemented, but a new one is created.
How can I edit, add or delete citations in an existing text?

I hope someone can help me! (Answers also welcomed in german)

Many, many thanks

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