Leaves clawing on young plant

Hello, first time grower here.
I currently have a two week old auto flower seedling that is showing some clawing on the leaves and yellowing on the lower set.
At first I thought it was under watering since she was pretty dry when I first noticed this, but the leaves didn't pop back up after if gave it some water :/

I'm growing on an indoors setup.

I think it could be nitrogen poisoning, since I gave her a light feed recently. But would like more experienced opinions.

Does your soil have any nutrients in it to begin with?...Did these symptoms only appear after the application of nutes?

I'm growing on coco coir, so no nutes in it.
I did a feeding on the end of its first week, and it really seamed to help. These symptoms began to show after I did another application of nutes at the end of the second week.