Photoshop Lightroom filmstrip problem (some photos not showed)

I noticed that photoshop lightroom does not display all the photos in the filmstrip; if I click on it however the photos are seen and if I open lightroom web I see all my photos in the filmstrip.
I tried to uninstall and reinstall the program, to disable gpu, to change color profile, to delete preferences. It didn't help.

imac 5k retina 2017

mojave 10.14.6

I7 core interl processor

chipset radeon pro 580

abobe photoshop 3.2.1