I have to wonder if some of these anomalies are caused by a majority of the stars in a galaxy being encased in some sort of shell or swarm...
They are finding all sorts of weird things out past our galaxy.
I was wondering about something similar: Is DF2 located on a filament of dark matter (which would be really weird... a dark matter deficient galaxy perched on a dark matter filament) like most galaxies, or is it located out in one of the great voids?