Net Book Values on Fully Disposed Assets

SUGGESTED

I feel like I must just be missing something obvious but I can't for the life of me figure out why I've got a bunch of old, disposed assets that have small residual net book values still remaining. These assets are gone, they are off our books in the GL but the NBV is still sitting in Sage and showing up on the reports and such. Surely that is not right. Is there a way to fix this?