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There could be several things occurring in the view that are not in plaing view on the dashboard view on Tableau Server. The workbook would need to be viewed in either web edit mode or Tableau Desktop to truly peel back all the layers and see what calculations are in use. Potentially filters as well that are not being displayed in the view.
If the workbook can be opened in Tableau Desktop I would check this blog on learning from reverse engineering a Viz.
Hope this helps!