Are you:“cutting” then pasting the emdnotes so they appear before the bibliography? If so and they aren’t stating in their designated location, as a workaround:
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After converting the footnotes to endnotes, make a copy of the document then convert it to text document which permanently removes the EndNote field codes (which is why you should use a backup file copy), You can then copy and paste the bibliography following the endnotes.
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Another possibility, although untested, is to insert two section breaks before the bibliography then cut and paste the endnotes in-between the two section breaks.