When you try to delete some nested anchors, it doesn't always delete all of them.
For example, using this test document and the Anchors panel, try to delete the middle three anchors under Fruits (Cheesecake, Chocolates, and French Fries). It will delete just one of them, Cheesecake, which is the first in the list, regardless of the order you select those three anchors. Or select all five fruits and it will take 3 clicks of Delete to delete all 5 of them.
anchors.afpub