Hmm, I was going to guess that maybe these cases are all related, e.g. same company, same (large) family but the status group seems to show that these originated from different areas.
Given that the VSC is transferring up to 50% of cases these days (possibly mostly non-employment based since we are seeing far fewer transfers in the tracker so far), its possible that you could get a block of consecutive cases which were transferred just by chance...
How are you determining the status group btw? Is this associated with the transferred status message?
ETA