Make the field wider and the question mark will disappear. The ? is FileMaker's way of telling you "I can't display this value". It happens either because the field is too narrow (data formatting may add currency symbols or additional zeroes) to display the value or the math used produced a calculation error such as dividing by zero. The fact that you can click into the field and see the correct value is the key indicator that all you need to do is make the field wider in order to display the value.