"For Unusual weapons and War Paints, these must be priced with the Decorated quality (white background), not Unusual (purple background). This rule is meant to standardize Unusual weapon and War Paint suggestions, since two qualities exist for these, and the Decorated quality is how these weapons and War Paints appear in inventories outside of fallback inventories."

I figured you'd be familiar with this rule since you've made several of these suggestions already. If next doesn't allow you to make the suggestion, make it under the old backpack.tf page and report the issue.