JD is right, the plant's baby leaves die automatically because the plant gains nothing from supporting them. The only purpose the baby leaves serve is to allow for photosynthesis and gas exchange when there are no adult leaves. Think of them as baby teeth. We don't need them anymore, we have adult teeth.

Also, they look very sativa to me. You can blame the stretchiness of your plants on this. Usually, sativas stretch waaaaay more than indicas do. You can always cut them down if you don't want them getting too tall.

And like everyone else is saying, if you want to avoid choking your roots and causing root rot, replant them in larger containers.

Good Luck

SMG