Number of rows is different to the size of array

Hi, am a newbie. As shown at the screenshot I have 2 queries, the one responds 5 rows and the second 6 rows. The data array of the first response shows a length of 6 whereas there are 5 items (= rows). The array of the Query B seems correct and shows also a length of 6. In a transformation where I multiply the values of the rows I get “NaN” as result. Is this behavior correct?

Regards Ronald