Kind of a large pot to begin the seedling in, but lets just not make you look bad and say that this is a mother and accidentally forgot to "root ball" them in small pots first. However, I feel that the reason that this is happening is because the soil blend that you are in is too hot (too many readily available nutrients already in it). Have you been feeding anything else on top of it? I would just make sure that the plant is not being over watered, and it will be fine. It might look a little ugly for a bit, with crunchy curling leaves, but it is just telling you that the pH is at a level that the plant is able to utilize the food in the soil, but there just happens to be a lot of it pre-blended. It would have just been better to go with a more quality soil, Ocean Forest is inferior to horse shit (not always, just the past few years). Look into blends like Mega Root, Air Max, Pro-Mix, etc. The idea is to get a highly aerated mix, preferably, and let the plants not get too much food at first. Let the cotyledons deplete themselves of the food already for them, and then start adding small applications of nutes. Good luck man, and enjoy that Waui, its a nice hardy strain for a sativa -Cheif