Whenever you setup discount on products using a percentage, it sometimes happens that the final price displayed on the product page doesn't suit you.
With Store Commander, you can redefine the final price after reduction, directly in the specific prices panel. Double click > Edit > Validate
This operation will recalculate a reduction amount, replacing the existing reduction percentage.
The same manipulation can be applied on combinatons, in the Combinations > Specific prices panel
Note that it's not possible to redefine a reduction percentage because the decimals would never be correct.