"No Slate Widget" issue

I am creating a simple UI for the shop. For that I use “TreeView”. After adding a single item to the tree view → 2 items in debug section are appeared for the added item:

image


The one with “No Slate Widget” has correct attributes values that I want to use further. The one without this text has “none” as value. I can’t find out how to fix it and why there are 2 entries for a single item added to the TreeView

UPD: This is how I add item to the TreeView