It's because I copied it from another worksheet but left out some identifying cells (nothing relevant to the calculation) so the dates are in e, f, g, sorry for the confusion
I modified it to reflect the correct cells
=IF(ISBLANK(F3),NETWORKDAYS('Network Days'!A2:A14, E3,G3),NETWORKDAYS('Network Days'!A2:A14, E3,H3))
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