Mileage Issue

We're just implementing Expenses.  During my testing I'm finding that when I go from the 'Create Expense Rpt' tile, enter in the Bus Purpose and Descr and then click on Add Expense, when I select Mileage Expense Type, it'll properly calculate when I enter in the number of miles.

However if I click on the Tiles -- Add Quick Expense or My Wallent and then choose the Expense Type  = Mileage --- it'll only populate the mileage field and won't calculate the $ amount.

In short, it works when I perform it going thru the 'Create Expense Rpt' tile and it doesn't work going through other navigations.