As you can see here the Arch flipped the scale and your auto scale did not handle it correctly.

Hey Nik, thanks for reporting! We'll work on improving the auto-detection. Could you send this plan to support@zztakeoff.com so we can do further testing?
As a side note, we can only have 1 scale per page, so if it detected 1'-0" = 1/4", no scale would have been set for the page.