They may not be ghost updates but instead may be reuploads of a different chapter or adding the officials.
I've been having the same issue as OP and there is literally nothing new added. I specifically checked for re-uploads and there were none.
Exactly
Then they were probably deleted or the site is being as dumb as it usually is
It just feels odd since I haven't seen many people asking questions or complaining. The sheer amount of comics affected aside, it's happening with very popular titles too like Eleceed and Myst, Might, and Mayhem.
Most recently I’ve noticed that when I try to read my updated manga, there often isn’t a new chapter to read. Now this isn’t all the time but it’s around half of the supposed updated manga don’t have a new chapter. Anyone else noticing this?