I did not take the TPV course with NPTA myself, but I would assume that you likely ran into a glitch of some sort. That being said, the script-illegibility problem itself is an excellent example of a realistic situation a pharmacy staff member could face with the verification practice.
The PTCB TPV exam did not (& I believe does not currently) have any illegibility-related problems other than if an image of the "product" is not clear. The exam is geared toward your ability to check the actual product(s) against the order, not clarify the validity or such of the order itself. There was (is) a zoom-tool available for all questions.
You could always contact NPTA to ask and too notify them of the possible glitch: