Expense Report Mystery

We have an expense report for a credit card transaction that was originally for one person for the amount of 34.99, but somehow the name on the expense report was changed.  Now, you can change the name on the expense report but you are then prompted to reenter the expense report information.  Based upon the name that you have selected, you can see any credit card transactions for that person and you make your change.  Here is the mystery...The name was changed but the transaction amount was the same although the person (name that the expense report was changed to)