Thank you! I did notice a couple things I hadn't intended to do in my changeset list, but I couldn't find a way to void some changes and keep the rest. I should have started over--I didn't know one of them caused such a serious error.

Can I ask you a question? They're adding a circular island at the intersection near me, and that's what spurred me to edit the map. But I can't figure out how to label it properly. The two streets that intersect don't widen, and it's not its own right-of-way--it's just a barrier in the middle of the intersection to make people slow down and drive around. It seems from here https://wiki.openstreetmap.org/wiki/Tag:junction%3Droundabout#Why_is_it_important_to_follow_this_tagging_guideline_if_the_map_looks_good_even_when_tagged_differently? that I might want "junction=circular", but while I can label it a junction, I don't see the two-part label as a choice. My other option is "traffic calming island", which is a choice on the list. But since it's in an intersection, I thought the other one would be better. Thanks for any guidance you care to offer.