Help index array formula return duplicate value?

[cyrous0425]

Whenever I entered a new name in sheet Enter Data the values itself duplicate in summary sheet, how to avoid this? Here's the link of my sheet. Thanks

https://drive.google.com/open?id=1fGWYlOa1ZnQaSqOQC8FShFcD4D48gu91

 

[Fluff]

Try
=IFERROR(INDEX('Data Entry'!B$6:B$100,MATCH(0,COUNTIF(B$3:B3,'Data Entry'!B$6:B$100),0)),"")