Seedlings bastards?

Just how hot is it in your tent? Lower the temp somehow also check the light download ppfd meter and see how much light they receive per day, dim the light, also I see nutrient burn on one lower the feed or check EC before u feed it lower humidity to around 65%, water the plant every 2/3 days wait till the soil is dry

No. They are fine. Look a little overfed or you environment needs optimizing better. For this stage of growth I'd aim for 18 hours of light, 25°c, 60-70% rh, light not too close and only feed very lightly like 1/4-1/8 of recommended strength. Hope this helps