Only 4 not 5 fan leaves? Why?

With these young plants that are still moving from the 1st single finger leaves into 3 finger and up to 9, it's pretty common for them to have incomplete leaves. Occasionally you'll see it with older plants too. The only time i had a plant consistently do this was when it wasnt getting adequate light, once it was increased the quirk worked itself out. There's definitely some odd leaf patterns out there and you even sometimes might find a leaf with extra tips versus less, but that seems to be less common. You little plants look great, watch for more of these oddities with this plant.✌️