Are #1's leaves showing burn-like signs?

9 times out of 10 with seedlings it's a watering issue. You can tell by the crinkled leaves as well that your environment isn't quite right so I would definitely keep your VPD in line as well as getting a moisture meter if over watering or under watering becomes an issue. Hope this helps.

The bit of lead warping on the first set of true leaves looks like it could have been caused by overwatering. Easy to do when the plants are young as their root mass is not that big yet. If the temps are high remember to keep the air movement up. Lower is better but it can handle it easily enough. RH of 55% at night is perfect I would not change it. Good Luck!

Can't see anything that would cause any concern for me. No plant will ever have 100% perfect leaves, 100% of the time. 32 degrees and 55RH are not going to be a problem for cannabis. Cannabis is a tough and resilient plant, not a dainty "princess perfect" exotic orchid.

Yep thats typical for heat damage. Just look and that shrunk on bigger leaf... Thats hurt by too high temp. Optimal for grow 24-26 max 30 (not good imo). 32 for hour can make such damage. U need to lower that ASAP. Humidif. For 3/4 first weeks optimal 45-60/65.%