Yellow nodes on seedlings and early plants

I have 1 lemon auto which is suffering from this. It’s in soil and has been getting ph water.
I have 10 gelato x og kush fems. Most of which are healthy exep ones in photos. They’re all in soil and havehad same light 600w hps since the start. Struggling to Resolve the issue. Here’s some photos can anyone help? There’s two healthy plants to show how the rest are doing im just struggling to see what I’m doing wrong with these two. This is my first grow so excuse any major wrong doing lol

Can't really see cause of the lighting. Transplant those bitches into a bigger pot, with some good soil. Wait a week or so and see how they are doing. Then watch the leaves and post again.