Where are they not syncing from? They will only sync from OS X 10.10 and iOS 8 devices.
Any changes made on icloud.com or on a previous version of OS X or iOS won't sync.
This isn't a bug, but known limitation.
On a related note, how did you install Numbers 2.4.1 on your iOS device?
You 1st have to down load an updated numbers & pages app's for dev centre, then once on the mac drag the files directly into iTunes app library, then sync to update them
Yup that's what I did and have them on both devices and my documents never load to the iCloud drive, guess that's what it is
I'll try a clean install later tonight, restored from a backup
I assume you have checked this, but did you go into Settings, scroll down through the apps to find Numbers, and make sure that the Use iCloud toggle is enabled? Maybe it became disabled when you installed iOS 8?