ssjones:
So, you're NOT reading this on a Kindle? Because Kindle is AZW. Not sure how you can have an AZW-compatible copy that isn't on a Kindle device or app.
Regardless, this kind of formatting isn't at all unusual if you're reading budget or free public-domain books where you're getting what is essentially a text-dump, not a careful conversion. I'd definitely expect something better for a full-price e-book. But that may just be the breaks when you're talking about a self-published book that was likely self-published in e-book format as well.
It looks like you've got full justification turned on. Again, I don't know what you're reading this on, but if you can turn on left justification for this title, that might help. You might also find that adjusting the type size might give you screens that are easier to read.
Of course, it's possible that you've got a glitchy copy. I haven't yet bought my own copy, so I can't speak from firsthand knowledge. But it sounds like you might just be dealing with a rudimentary conversion that wasn't handled with the care a professionally published book would (or at least should) receive.
Bob