As @BruT mentioned, augmentations data are applying to an objectid. So if at any case, the item with this object will be deleted (probably manually) without deleting the correpsonding augmentation data, then the next item which will get this object id, will automatically restore the augment. As you already saw, you may see the item name as Augmented, but the stats / skill is not appearing at the tooltip. This is happening because augments are not implemented on C6 on armor type items.
So, the problem is located at a bad move by you. I doubt frozen have that issue (even though is so bad)