Hello,
Thanks for your answer – the problem was resolved by manually re-arranging one of the projects in the project order when editing the thumbnail grid and then saving it (so I basically kept the same order but moved one project around, just to change something).
However I still don’t know how the random order appeared in the first place, all my plugins seem to be working well alongside Lay theme, and all my software is up to date…
Best wisehs!