mtl_material_transactions ... SUM Produces Multiple Rows?

Can someone please explain to me why the query below is producing multiple rows for a single date?

I am baffled, I need to view the SUM(transaction_quantity) by date but the query produces multiple rows for the same date and I cant figure out why?

SELECT

transaction_date,

SUM(transaction_quantity)

FROM

mtl_material_transactions

GROUP BY

transaction_date

ORDER BY

transaction_date

;