To check if there is an error, we need to know what steps you took before all went wrong in your opinion.
Send an email to [email protected] with the subject "Error in calculation" and attach:
The description of the sequence of your actions, so we can get the same result as you
The description of the calculation discrepancies
Screenshots that show the error
Use the “Share this result" function on the results screen if possible, so we can see the exact hand or situation where the problem occurred.