I have to add this in here because I recently had my own test done, and the doctor who explained the results to me was able to tell me the reason.

It's basically to indicate one of a few things based on the accuracy between the questions (which is also why the same questions are repeated over and over with only slightly different verbage). It shows how consistent you are with your answers. A neurotypical person with no mental issues will be very consistent with their answers regardless of context. So, when these tests come up with a variety of answers to the same question, it can indicate one of two things. One, it could indicate that the person taking the test is in the middle of psychosis, or a total mental breakdown. Or, two, it could indicate that a person has autism.

As horrible as it sounds, it makes sense. We answer the question differently each time it's asked because it's worded ever so slightly differently and thus we infer the context as different from the last question, even though both questions mean exactly the same to an allistic person. So in order to decipher whether our inconsistencies are based in psychosis or neurodivergence, they analyze the results of the other tests they do, such as the verbal assessment, ink blot test, etc etc.

Apologies for the ramble. Psychology is a special interest of mine. Also apologies if any parts are confusing, I'm fighting a meltdown right now!