Unwanted Transform Node

How do I get rid of this transform node ?, it was created when I parented my root controller
group to the root joint, see pic. Either one of those nodes have a negative scale.

These transform nodes get created when you change parent of a joint and parents have different scale or shear transform values.

In this particular case you can try freezing tranfsorms of Root_CNTRL_GrP before parenting Root_JNT to it.