Most of the galaxies come from an old catalog that we didn't make ourselves, and I assume that the distances were generated directly from redshift values and are therefore not going to be extremely accurate. Getting significantly better data for each galaxy's distance requires manually researching and inputting distances for each individual galaxy, which is extremely time-consuming when talking about a catalog of 10,859 galaxies. Assuming they can be done at a rate of 1 per minute (which is very optimistic), it would take 181 hours of continuous work to fix all of them, and that's just to correct the distances and not any other errors they may have (in most cases, the distance isn't precisely known to begin with).

You can manually edit the catalog yourself if you want, there is documentation on our website explaining how SE's files are organized and how the catalogs work.

Thank you for the answer. I have successfully been able to create my own files to correct things.

Another problem I noticed when doing this (and which exists in the original files too - I was very careful to verify that), is that orientation of galaxies is often if not always wrong. Two easily verified examples are the Leo triplet (M 65, M 66, NGC 3628) and the Draco Trio (NGC 5985, NGC 5982, NGC 5981).

It is unclear to me if the problem is with the underlying data, or with the way the rotations are being applied within space engine itself. Mentally manipulating quaternions in my head is not easy for me, especially since I don't know the sense of the axis within the program itself.

Orientations are another thing that has to be done manually for each galaxy, unless you know of some database that contains quantified orientation information for those galaxies.