I noticed that the first volume of the "Universal Monsters: Icons of Horror Collection" box set was not nested, though the second volume was, so I updated all the individual discs in the first volume with the Edition name (consistent w/ existing 2nd volume in database) and submitted those contributions. But, while I have locally nested the overall box set correctly, when I try to submit those changes, the website says "No changes detected" for the top-level set and does not allow submission.

What is the correct method to do this? I kinda feel like an idiot, because I've done this before - and very recently! Not sure what I'm doing wrong/differently now. Thanks in advance!