Week Number incorrect in CRM in Calculation of week

Hello,

I am working on CRM 2016 Online update 1 application .

I have a chart which shows number of open leads per week. 

The leads created today 17/10/2016, it should be present in week  42 (real calendar), as we are in the 42nd week of the year, but in the CRM it show always one week extra, so week 43rd  for leads created today.

Any settings which i need to do by going in System Settings -> Formats->Date -> First day of week , First week of year ???