https://forums.backpack.tf/topic/6033-rules-for-unusual-price-suggestions/

Due to some confusion caused by unusual weapon and warpaint suggestions and the pages they can be found on, we've decided to require unusual weapons to be suggested on the "Decorated Weapon" Quality page. This has been the case for the majority of the weapons already, but some displayed as "Unusual" as quality, and were therefore suggested on that page; it will now be obligatory to suggest those on the Decorated Weapon stat page as well.