As gmslave writes. repot.
And it seems like it's too hot under your lamp, so try raising it a bit. Sides of leaves curling, is usually a sign of heat stress.
- I have very poor temp regulation in the room my tents placed in. So I often see temps between 29 and 31 celcius. A bit too long time above 30 and I see leaves starting to curl a bit..
It's not the end of the world tho.. They'll still grow, just gotta fix the temps a bit.