Hello, you are asking difficult questions since I validate lots of tasks every day. General reasons for changes are unsquared buildings, disconnecting shared nodes or just simplifying shapes.

Hi, I don't believe that small differences in size of buildings make any difference at all due to the imagery resolution. This is an urgent project and I believe this kind of precision is not crucial.

Hi, I was validating the urgent project on the HOT tasking Manager. During this process I was fixing common mapper mistakes like unsquared buildings and connected buildings to roads. I might move buildings slightly and some minor service roads. I don't believe I've touched any features tagged as place=farm. Antonin.

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

Hi @Frans S I think you tagged the wrong mapper. I've downloaded the content of this changeset, filtered objects mapped by Thea Satneshamah and runned the Mapathoner tool to select non-orthogonal buildings and 0 results were selected. So in my opinion features mapped by Thea are correctly squared. Best regards.