RQS Royal Jack Automatic first grow

Germinated after 3 days (seeds planted on 01/03/2024) using RQS Starter Kit propagator with propagators's light on. Took one more day to stand up and open leaves. By the moment they were transplanted, they already stood quite tall (only 3 cm left to the light) and had very long root (about 10 cm long) buried in propagator's perlite. Growing medium - 80% BioBizz Light Mix, 20% perlite. RQS Easy Roots Mycorrhiza Mix (4 g mixed in soil and 1 g directly under the seedling) and RQS Easy Boost (37 g / 10 l) were added to the mix. The tallest seedling was transplanted into 18.9 l / 5 gal textile pot (right one), the other one into 6.5 l / 1.7 gal plastic pot (left one). After transplanting they were watered 300 ml / plant of unfiltered water pH'd down to 6.5 pH in a circle about 3 cm around the stem using syringe. The light was positioned at about 50 cm from the tallest pot and turned on 40%. The rotating fan was tuned on the lowest setting and positioned over the plants to create light breeze but not make plants wiggle. Overall, one hour after, sensor is reporting 21 degrees Celsius temperature and 69% relative humidity. Also, small whitish spots appeared on the tips of first real leaves on the right plant. My guesses are - these can be either light burns from the propagator light or too much Easy Boost being added to the soil mix. Could also be overwatering.