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Need help understanding a simple formula

This formula is for the height of a base filler.  I unchecked "knotch for toe kick" and added .5 for scribe to floor.
=IF(Notch_For_Toe_Kick=1,Height-Toe_Kick_Height,IF(Filler_To_Floor=1,Height+Scribe_To_Floor,Height-Toe_Kick_Height))
The height is 28.5".  If I read this formula right, the value should be 29, but it's not.  It's 28 1/2".
Attached video shows the design data sheet and the formula check.  The formula check indicates the value is 29.  Yet, the value is 28 1/2.  Can anybody shed some light on this discrepancy?

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