Rank node is node is not only ordering fields by "Order By" fields , it is also selecting Top /Bottom N number of records. In your case, it is supposed to show you TOP 1 date .
What you might try is...
Create a Calculated Column in Projection Node . Define it as concatenation of Date and QTY .
Output should be like ..
02032016100 and 02032016200
Use the calculated column in Order By .
Note: You have to make QTY as String/Char before concatenation . Date format should YYYYMMDD . This would take Latest Date and highest QTY .
Let me know if that works for you.
Regards
Anindya