new threadleaf japanese maple leaves are turning white/pale pink

I planted a new threadleaf JM a few wks ago, and some of the leaves on the bottom are turning a pale pink/white. I planted it in a raised bed w/top soil and sphagnum peat moss mixed in, in front of my east facing house. Is this just transplant shock or something else? What should I do? Thanks

 

Sounds like normal colouring of new leaves
What should you do? Enjoy :)