Substance painter: Can't change project resolution without losing materials/details

Hello everyone!
I'm having a very weird problem and would be greatful if someone could help me...

Whenever I try to change the resolution of my project from ''2k to 4k'', or ''2k to 1k'' half of my textures stop working or dont show properly.
Which Is something that never happened before and I can't find anywhere a reason for that or a way to fix it.

Project in 2k

When changed to 4k

And remaking the project cannot be a solution as again I never had this problem before...