I've never seen ncdu do this. What's the matter with the red
S and extra size columns?
This is a Windows root (NTFS, mounted with
ntfs-3g), so I assume it has something to do with NTFS. But the sizes in the extra column make no sense at all, nor can I find any documentation of what it means.
Interestingly only directories have the second size column, but not all of them have it. And I find no pattern between those that do and those that don't.
Places I've researched: