Report on quotation return duplicate raws of the same quotation

I have created a report the return all the quotations that needs to be handled by my team.

I setup custom field to set the target close date of each quot.

Now I am trying to generate a report that will list all the quotation needs to handled grouped by the CLOSE DATE and subtotal the grand total of each such date.

The result is a report with duplicated lines of the same quotation