Using hierarchy for Date filters

Hi,

I am trying to use Date Heirarchy and when using, when I drill down and if data has more than a years details, numbers from the years are getting mixed given the total. eg., if Jan 2017 value is 15 and Jan 2018 value is 10 i am getting only 1 column with value 25 which is wrong.

I am using Matrix visual and filtered to get data of Q1 for both 2016 and 2017.

I am looking to get something like

  But I am getting 

It seemed like basic requirement but I couldnt find where I am missing.

Any help is much appreciated.

Thanks

S