Just to clarify, the items aren't showing in your inventory at all, or just not in a category when you have Category set to Yes?

Is this still happening for you? I had tested it back then, and even now, and I can't replicate.

The Grape Gummy Ham doesn't appear to be in a category, but the item still shows up in my inventory.

Double-posted, sorry!

Hopefully that's the case. :) Please let me know if it happens again.