In A1 enter Current Investment. If you cannot figure out if the cell is the cause of the circular reference click the next cell in the Circular References submenu if available. In B1 enter Total Investment.
Review the formula cell.
The Round function in Excel falls under the Math Trigonometry formulas. On each line the calculation cell is in the cell to the right of the birthdate. Click the Cancel button. In your Formulas tab in the Formula Auditing section select Trace Dependents.