Not all leaves, particularly the youngest ones, are going to be perfect all the time... some grow with strange shapes, others get strange colorings that do not make any sense at all. Before you worry, wait until you get some true leaves on this one... 3-5 leaved fan leaves - and keep watch. I think this will sort itself out. It may look different from the others, but we're not growing cookie-cutters here! One of my grows - the Glueberry - is case in point... 3 seeds, 3 different behaviors - and one of them has steadfastly been lime green all the way through the grow so far no matter what I do to her... but she's giving me good flowers and she'll give me a good harvest!
Good luck!