For what it's worth, I think when you click on a series it defaults to the latest chapter (which doesn't make any sense to me if you haven't read the series before...) and I don't know if that counts as a view, so how long in between updates may also be a factor.
e.g. If you write 10 chapters but between the 5th and the 6th chapter you had a delay and couldn't update for 2 weeks, then the 5th chapter might get 2 weeks worth of views by people browsing to your novel, as opposed to all other new chapters only getting 1 week of new views when it's the latest?