I don't know if anyone else has noticed this, had a quick browse and could not find anything similar.
When you go on to a Group's page to look at their "Latest Updates" the list is not organised by release dates alone but it also Groups it by Manga title, so appears to show the most recent release at the top then all the other releases of that manga then the most recent release of a different manga and all the other releases of that manga and so on and so on.
I notice this has happened only recently within a few weeks I think.