If it's anything like my experience it's luck of the draw on the proctor and their "interpretation" of things. I used the same room and setup for every exam with them. Second to last one, the proctor said my room was 100% unacceptable. I protested and was told that there was no way this very same room ever was considered acceptable. So I moved into a new space and finally moved on to the test. My last exam with them? Used the old room and had no issues.

The proctors are random, poorly trained, people being paid near minimum wage in the American South that probably turnover every few weeks. I can't expect a high degree of judgment.