Hi , It looks like the pot is too big for the plant . What happens is there is to much mix around the root ball and it does not get the air it needs . Also did you soak the bark before using it ?
It is best to shade a plant a little after repotting , if the bark was used dry it might not be getting enough water new bark repels water . Root bound is not a bad thing for a lot of O kids . Hope this helps a little . Gin