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Alteryx uses the active area of the worksheet to determine what data to read. As mentioned here, Excel sets the active area of the worksheet so that it extends to enclose all the cells that have data or formatting. In the attached workbook, the cell L14 has format set to Centered. Even though there is no data in this cell, the active area includes this cell. The referenced article gives step for removing the empty but formatted cells in the original workbook.