Baby SD wont grow

ok so i currently have 3 plants that are 5 1/2 weeks old. The two others are between 2 and 3 feet but i have a sour diesel plant that is the same age and its only about 3 inches tall with few leaves. Im growing them indoors under 2 t5 lights I dont really understand because the plant looks healthy for a brand new plant but it should be taller by now. If anyone can explain this bizarre thing that would be SOOO great!


:weed: Happy earth day everyone!
 
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