Thanks, Lucy24. The "ever crawled" also goes up but not at the same rate. "Ever crawled" used to be 5 times more than the sum of "indexed" and "not selected" . Then, over time, it came closer to the sum, although still not quite there yet (still about 10% higher than the sum of all other types).
I think I should just chalk it up the data not fully in.
It is unfortunate that they do not differentiate between internal duplicates and 301 redirects which could be counted as "internal duplicates, rectified". In other words, it would be very useful to see how many internal duplicates exist and how many of those were fixed, in case you're working on eliminating duplicates.
Let's hope this tool will evolve into something more useful!