They bend, because your sub is packed to lose bud.
As the roots grow, if they pass through a weak spot and say there's substrate movement, them roots are pushed pull a part of your stem, and hence they fall over. They having difficulty rooting to the sub. This will subside after a while
Your splints are working grand. They look in good shape.
What they're about 12-15 days old. So, look nice and light not too much N which you'd be surprised how much we see that here.
Good Growing