Total sum of three custom calculated columns is not calculating data correctly

Summary

I am working on learning report where I need to sum three custom calculated columns to get the total completion of 3 set of courses.

I am performing sum of all these three custom columns using + operator and selecting aggregation Rule as Sum. The column Total Completion is not calculating data correctly.

Content (required):

Sum of three custom columns not calculating data correctly in pivot table.

Subject Area Used-Learning Management Real Time

Version (include the version you are using, if applicable):

21 D

Code Snippet (add any code snippets that support your topic, if applicable):