Why it shows wrong total all the time ?

[AnandRanga]

So many times I face this, This image can explain it exactly:

In  both of the columns it is showing the total 80, while it is not correct. 

Is their any thing I miss out every time?

Thanks for your time.

[v-yuezhe-msft]

Hi @AnandRanga,

It is always caused by wrong DAX formulas or model relationships when totals don’t work correctly. Could you please post sample data of your tables and list the relevant DAX formulas with which we can test?

There is also a similar blog about total issues for your reference.
http://www.powerpivotpro.com/2012/03/subtotals-and-grand-totals-that-add-up-correctly/ 

Thanks,
Lydia Zhang