I had this same problem. To investigate it, I looked up the definition of ottavation-ordinals in ly/property-init.ly. I 
then created a new ottavation list called ottavation-ordinals-b, with "va" and "ma" changed to 
"vb" and "mb" for the negative ottavations. I included the new ottavation list in my lilypond file, 
and set the ottavationMarkups to my new list. I don't see anything in property-init.ly thanks

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