Weird formating issue: exams.vis

The issue appears in the unpublished exam "Wahrscheinlichkeit und Statistik" FS21 exam (please use an admin account to access it) :

https://exams.vis.ethz.ch/exams/6snjn4mg.pdf

When cutting the exam, I realise some of the pages are reverted and zoomed in, which can be seen in the attached picture:

Even the problem is not new since this also often occurs in the Analysis exams, the format problem will occur more frequent and it may affect some of the correctly formatted pages when scrolling up and down. Moreover, the Analysis exam will not affect the content of the zoom whereas the WuS exam does:

Even I have switched my browser and computer several times, the problem still occurs.

I would be appreciated for the fix of the problem in order to make the exam public to everyone. Thanks a lot.