According to the move/deletion log, you changed the name of this category to "Stamps" from "Stamp". I assume by "official Neopets category" she means that on the Neopets games/reference materials, it goes by "Stamp" instead of "Stamps" and as such, the category should follow that and be "Stamp".
I'm sure it isn't called categories but most games have some sort of organization system and I have a feeling "Stamp" would be one of those top-level ones.
The problem SSBB_Crazy had (I believe) is that you moved the page to a plural version (Stamps) despite the proper naming being just "Stamp".
I don't know why it would work or be named like that, but it seems that is the case. I think (just based on a quick google search) proper naming would be "Stamp List" instead of Stamp because that sounds akward and instead of "Stamps" because she doesn't want that :/
What Nagare said. Neopets has their own way of categorizing items and they call it 'type' I believe. By clicking on an item in your inventory it brings up a menu with all the info. on that item including 'type'. For some reason Neopets has some wierd categories, sometimes they are plural, sometimes they are singular. For example it's 'Stamp' not 'Stamp' and 'Slushie' not 'Slushies'.
Also, 'Snowy Valley Stamps' inside the 'Stamp/s' category is not an official categorization, I made it so I could seperate each of the pages so it's easier to find what you want. ^^
I think I see what you're saying. That fact is, an item 'type' is not the same thing as a Wiki category. Although an item may be listed in-game as a "weapon", it would still go into Category:Weapons, wouldn't it?
I understand that you were bothered because I moved the category page, but as far as I can still tell (you haven't convinced me), it was the right decision.
Well it's Neopets way of categorizing Items so shouldn't we follow that? There isn't just one type of category (type) for weapons either, there's Haunted Weaponry, Maractite Weaponry, Wonderous Weaponry, etc. I just think we should keep things as factual as possible, changing it changes the idea that Neopets followed.
On the Disgaea Wiki, I have all Belts on the same page. If instead I were to make a separate page for each, I would categorize them into 'Category:Belts' because they're all 'Belts,' regardless of the fact that they're all of the item type 'Belt.' Item types in general tend to be singular; 'Weaponry' is a weird pluralistic exception.
On a Wiki, making a category name plural just makes more sense most of the time, and I don't think pluralizing an item type for a category name detracts from the original designation. What might be even more true to the game would be to call it 'Category:Stamp Items' or something, but I'm not a fan of that (I used it on the Disgaea Wiki for Template-related reasons when I was a wiki code nub, but I plan to change it eventually).