Last Summer, I bought this hoya with the big beautiful leaves. Sometime since then, it spit out another leaf, but the leaf is curly. I'm concerned the plant is lacking something. The other two leafs are flat as a pancake. But, this new one curls from the tip backward/upward toward it's stem.

Anyone seen this before? Also, does anyone have any advice on this particular hoya regarding water, sun, food, etc? I'm having trouble finding much information on it. It's the Sumatra type, not the West Java, which I gathered from images online. It's leaves are big in all directions, not long/narrow. Gorgeous leaves.