There could be a lot of factors contributing to this: format of columns, data, field type, etc. Are you able to share a packaged workbook? You'll likely get a better response if we can play with your workbook rather then guess by looking at a screenshot.
I cannot publish the workbook with data thts not shareable. But i figured why it is not displayiing as one of the measures I am adding has null and so it is not displaying the addition.
Do you know how i can replace null with 0 in the data ?
Depends, but typically
zn(lookup(sum([Filed of calc]),0))
can replace Null to "0"