Today I am no longer able to export my layouts with the colours that I have set up in the maps. At this point, I have exported over 100 layouts from this project (or some version of it as I save a new one every week) and this problem creeped up without me having changed anything to my knowledge.
This is what the layout looks like in layout view:

And this is what it looks like exported to pdf:

My export to pdf settings are always the same:

Any idea why this is happening?
Thank you very much!