Data Export not pulling level 0 descendants

Summary:

I am pulling some data from pbcs using a data extract for one of my customers at zero level but there are a number of zero level members not being returned, instead it is returning the direct parents of those zero level members.

Content (required):

I have included a snip of my export script, the highest parent member in question is "CC_PM30" and I am trying to pull all of its level 0 descendants.

I will use CC_30120 as an example as one of the zero members it is not returning. See below the dimension hierarchy.

instead the export is pulling member CC_PM424 which is CC_30120's direct parent. See below.