Do you have any info you can share about what you’re using and how you’re using it? Maybe a couple more pictures? This could be a simple leaf variegation or something more serious. Very difficult to tell with only 1 full leaf in picture and no supporting info.
It was Fox farm ocean forest soil but I just had it in a Solo cup. I let it go a little too long I was a little bit over 14 hours light . And the lights I use are junk lights full spectrum. I just use them usually to sprout my plants. I repotted the plant but it already had the condition before I repotted. I top dressed the soil with coffee grounds and rabbit manure that I’m using now. That was probably two days ago. What I repotted in was back to The Roots organic potting mix. But that has nothing to do with the condition of the plant now. Fox farm in Ocean Forest are too expensive to buy now in Michigan I used to get the big bags for $12 but the grow shop went out of business. A small bag was I believe $15