Multiple paper submission deadline extension (three times in few days)
Typically, I have seen two cases of deadline extension:


Some venues have a "customary" extension, which always happens, and thus all regulars know that the de facto deadline is slightly later than the initially stated deadline.
The other main case of extension is when a venue wants a few more submissions and is hoping an extension can drum them up.


Multiple deadline extensions sounds to me like desperation, and you might well be looking at an event that will either be cancelled or accept a lot of trash.  Unfortunately, there's not much you can do about it right other than withdraw your paper if you are nervous, which might not help you much either.