Sorting Labels in Outline View Not Working

Hi, I have about 40 folders, and then about 10 individual documents within each folder. I use the label feature to tag some of the documents. The problem is, when I click on the label field at top of outline view, to try to get them to sort, they don’t sort. I want all my documents marked with a particular label to rise to the top.

The pictures show, when you scroll down, that no matter if I click the label field, the marked labels don’t rise to the top, they seem highlighted in orange somewhere in the middle.

I’m not sure what it is you are looking for, as this screenshot seems okay to me. The stuff with no label is grouped together at the top (or the bottom if you click the header again to sort the other way), and the label stuff is all together. What is it you are looking for precisely?