This is my first Plumeria plant. I bought it from a local nursery and repot it to a 10" pot right away. I watched lots of repotting videos to Plumeria and found out that it is better to not repot it that deep because the stem might rot. When new leaves started growing (which was exciting for me) they all have wrinkles as shown in the pictures. I never took the Plumeria outside yet as it was getting cold when I bought it.

What did I do wrong or what is wrong with my Plumeria?