Hi, looks like the changeset is the part of the validation of the project 16391 on HOT TM. I usually do multiple task validation and the usual steps are square unsquared buildings, remove unnecessary nodes of the buildings (simplify shape) and fix JOSM validation errors and warnings. In this case I believe the warning was highway end in the area and the resolution to this was to unglue paths and move them slightly so that unglued nodes don't share the exact same position. But the changeset was closed 10 days ago so it's a bit hard to remember what warnings and errors were to be resolved.
Antonin