Does anybody have an idea what could be wrong with...

I c the plant has CalMag issues. Look at the brown dots on first true leaves. CalMag problems lead to troubles with root system. Thus plant grows tiny and sick. U should start the CalMag supplements, in the dozens recommended by manufactures

Hi Budga2 By The looks off things is genetics It will happen often. It's normal to have some leaves twisting. It has happened to me without any serious problems in later stages. I don't think you have anything to worry to much at the moment. Leaves mass growth will get into shape soon. Suggestion You haven't feed nutrition so far is she struggling to grow possibly? And that Could causes her to twist because working to hard to survive. I Can see that you not used any Nutrition so far in your diary. Probably should be using some Grow Nutes in week 3. Your girls look healthy and ready to be feed, start with 1/4 recommended doses by suppliers. Hope this helps good luck and happy Growing.

looks genetics to me.pretty much normal as I've seen the same in my grow before.everything is well prepared there.second set leaves looking fine,newer growth looks a little bit twisted but they always seem like that and get better as it grows.no worries.