Trouble with duplicate entries with FORMS
Answers

You need to adjust your COUNTIFS
COUNTIFS([QN Number]:[QN Number], @cell = [QN Number]@row)

Paul,
thanks for your response. my problem is, I need to move the duplicate entry to another sheet but with this formula, both identical entries turn to duplicate.
I still need to keep one of the entries to perform the work requested. I can't seem to be able to do that

You will need to insert an AutoNumber type column (called "Auto" in this example and formatting doesn't matter) as well as a text/number type column (called "Row" in this example) with the following column formula:
=MATCH(Auto@row, Auto:Auto, 0)
Then you would adjust the COUNTIFS like so:
COUNTIFS([QN Number]:[QN Number], @cell = [QN Number]@row, Row:Row, @cell<= Row@row)
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