When we did the initial import from Curse.com to CurseForge.com we didn't include properly categorized UI Packs & Compilations.
While we are working on a new system to help handle UI Packs properly we have an interim solution of these projects being manageable via the old Curse.com admin interfaces.
We'll finish importing these projects in the upcoming weeks, but for now you can continue to manage them on Curse.com.
