They look healthy to me. Slight upward curl with bright lime tops usually means the light is a bit strong or too close, not a problem with the plant. Raise the light 5-10 cm or dim it a little and see if new leaves flatten out within a few days. Also check that your tent temp stays under 28°C and that runoff pH is 5.8-6.2 for clay pebbles. Some young plants also stay compact before they stretch, so no worries if the rest looks good