I've been going through *all* my dragon's lineages in the process of making a few new groups, and I've noticed this a few times now. At first I thought it had something to do with dead dragons in the lineage, but now I'm seeing it on lineages where there are no dead dragons. This dragon shows this:
Any idea why this happens, and is it a bug or some sort of feature?
edit: Another example of negative gens in lineage, strangely also Dorkface-related.