Hey there, bro! 👋 Little plant showing signs of light excess, raise the lamp higher. When the plant has 3 sets of leaves, put the lamp back in place. It seems the bigger plants were a bit larger than the small one initially, or the small plant was in the center of the lit area, while the bigger ones were on the sides, which caused the small one to get light burn, while the bigger ones managed to survive and grow foliage for that level of light! Good luck, bro! 👌😇👍