Networkdays Formula showing -2 days.

I created a Network formula to account for the number of days between when a form is submitted versus when the form request is "approved" via smartsheets. When a row is approved it records the date in a separate column. However, the formula for Network Days when I approve the row on the same day is showing -2 Days. Any thoughts on what might be causing this issue? See the screenshots below.

COLUMN FORMULA: =IFERROR(NETWORKDAYS([Creation Date]@row, [Approval Date]@row), "")


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