I kinda knew that, but didn't put two and two together. All is explained.
Given that the county controls the process, I think the blame for Denver's voting snafus pretty much belongs to the Denver election board. And given that Denver leans heavily democrat, I don't see a lot of nefarious purpose there, just a general mess-up. I imagine they'll get it worked out next time around, or at least you'd hope they do. I don't know what effect it will have on anything -- neither the relevant congressional race or governor's race look close, but I need to dig up results for more of the races -- I do know at least one person that didn't vote because of it, though.