Hallo everyone :)

to ef835f90: what the other two are referring to is the size of the bounding box your changeset produced because you changed something in Algeria and something in the polar regions of Russia in this edit. This is something you shouldn't do if it isn't really necessary. Here's the explanation:
https://wiki.openstreetmap.org/wiki/Changeset#Geographical_size_of_changesets

To halloschorle and h0rr0rdrag0n:
here's another tool to review this kind of edit: https://resultmaps.neis-one.org/osm-change-viz?c=151718740#4/21.41/1.19
Also maybe make a bookmark of the wikipage I linked to above so you can kindly point newbies toward these guidelines. I can relate to your feelings about large bboxes. They can happen by mistake. 

happy mapping everyone :)