Pivot Table - Totals on calculated field working, but not on subtotals

I have a pivot table with a % difference calculated field that aggregates and calculates correctly in they Totals portions of pivot table, but at the sub-total level it is inaccurate.

Rows are district (subtotal) and clinic (lowest level)
Column is Day of Week Starting

Calc field in question: percentDifference(sum( FTs ),[{Day Week Start} ASC],-1,[Clinic])

correct calculation at totals level

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