Known Issue: Duplicate value on fetch from worksheets
ISSUE: Tableau does not return all data based on filter for Simple Metric
If there are two or more Charts at the Tableau view, the data fetched from this view by the Tableau plugin is going to be improper; e.g., if there are two Charts, there is going to be twice the number of rows expected; if there are three Charts, three times the expected row are returned. This error occurs due to Tableau API issues (v. 9.3, 10.0).
As long as we are pulling the data with the results that we expect from Tableau given the '?format=csv' download, everything should be OK.