Why are there keys instead of values ​​in the chart legend?

Question

Microsoft Access

When I create a chart using a table, values ​​are used as legend labels. And if I create a diagram on demand, then in the legend instead of names there are their keys. The request is, for example:

SELECT DISTINCTROW Расходы.Месторасположение, Sum(Расходы.Стоимость) AS Стоимость
FROM Расходы
GROUP BY Расходы.Месторасположение;

So, instead of "Bedroom", "Kitchen"... in legend 1,2,3...