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Material Graph instance not showing all params

Having what is probably a very newbie related issue with a material graph here. Can anyone help please?

There are three Param Text Objects in this Material Graph

Yet when a Material instance of the same is derived - there are just two - the NOH Texture has jumped off into space.
Also each step of the graph previews as it should.

What is it that I am doing wrong?
Thanks

Noone really?