Are you feeding it?
You should have started feeding it. When Knowm said not yet. I don't think he can see the pic's very well. Because you can see the 3rd true leaves have grown in the pic right before that.
If your plants are not growing and look like they are eating itself. Then it is starved. Is the stem purple. If it is, they need food.
You should start feeding them anyway. Once you do. They will grow out of any wierd growth paterns most likely.
Get some veg food. Organic is best. 20-20-20 is a good chemical nutrient level.They need nitrogen bad. Thats what makes them strong. And that what makes them grow.