That looks awfully healthy to me! New leaves.
I wish all my plants looked that happy!
It doesn't look to me like root rot or any kind of poor drainage. But, if the plant is putting THAT much energy into new leaves right after transplanting, it either has a lot lot LOT of vigor, or it may be under-emphasizing root growth.
It looks low to the ground this year - maybe a little shade would be easy to arrange, if it has afternoon wilts.
