I should have mentioned, that my data source is a CSV adapter with a file containing 16 records. I've created a new dataset with sorting by field "Product" bu in "Data Preview" rows are duplicated (first 16 rows are in the usual order and then there are another 16 rows sorted accordingly to the Product field set in Sorting tab. Also When I hooked it up to a bar chart, my chart is completely empty. My chart is configured as follows: