The school should give some kind of concession to those whose tests were incorrectly formatted.
There is NO REASON for any differences in the format for exams given to students taking the same test. The only reason is ERROR. Such differences are, at least plausibly, distraction-causing. On that basis alone, concessions should be made.
The only reasonable argument to the contrary IS NOT that all students are responsible for checking their tests, it is that the formatting errors did not affect performance on the tests. In a timed examination where any distraction can have an impact, this argument is dubious.
The "personal responsibilty" argument holds water only if all students were given tests of the same format. In that case, no student could argue that failure to understand the format put him/her at a disadvantage with respect to other students. As it is, there is no way to refute the contention that the format for some was more distracting than the format for others. That is unacceptable and should be corrected.
One of the things I really dislike about the legal field are all these people who are so quick to cry "personal responsibility" when it comes to others when you KNOW they'd be kicking and screaming (and probably suing) if the misfortune were their own. The practice of law either attracts or creates these kinds of personalities, I'm not sure which.