With the example, Actual shrinkage should be calculated as 28% only. and the Calculation logic you have mentioned is also correct.
Could you please provide some more information here, probably screenshots (with the tooltip text) from the UI? This would help us understand the issue better.
I would also recommend reaching out to care, as we are not able to debug issues with customer data in the forums.
Thanks
------------------------------
Vikas Srivastava
Genesys - Employees
------------------------------