I've noticed that as my figs are growing vigorously, on some of them the shape of the newest leaves progressively shifts from the normal, lobed shape to a simpler, triangular shape. On this Tena you can clearly see the transformation over the past few weeks from long, narrow lobes low on the plant to the new shape at the top. The leaves look healthy, so I'm not concerned, but I am curious about it. Can anybody tell me what's happening? Is this normal?