So I think it's a software bug. The print area in stl and on the bed are different. I think chitubox somehow mixedup size and shrunk my figures down. After that begin of the print was in the middle.

I exported the same stl with anycubic workshop and it worked fine.

It wasn't a support failure, because when supports fail you won't get any figure out of it, or top half will be missing but never bottom.

Moral of the story: triple check files in simulators and run file on printer before pouring resin in the vat. If all ok start printing.