How are you saving the PDF?
Are you printing to a 3rd party PDF converter or are you publishing (saving as PDF) - hence using Archicad's built in converter.
I find publishing is the best option.
I have found that using a 3rd party PDF converter (printer) can cause problems with fills not appearing correctly - although I have not came across this zoom issue.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11