The ID column of checklist viewer appears to have an ascii sort so rather than sorting items in numeric squence it sorts alphanumerically (1,11,12 instead of 1,2,3).
If the intent of this checklist view was to provide editable leafs then either drop it and use the property view OR drop the whole list of items in checklist view and reflect only the item in selected in the tree view.
The ID column of checklist viewer appears to have an ascii sort so rather than sorting items in numeric squence it sorts alphanumerically (1,11,12 instead of 1,2,3).
If the intent of this checklist view was to provide editable leafs then either drop it and use the property view OR drop the whole list of items in checklist view and reflect only the item in selected in the tree view.