Hi,
your problem is you copied and pasted without modifying variables. Check InputVariables d4-d10 utilise d3 instead of their respective variable.
For example:
InputVariable* d9 = new InputVariable;
d3->setInputValue(0.0);
d3->setName("d9");
d3->setRange(0.0, 1.0);
d3->addTerm(low);
d3->addTerm(high);
engine->addInputVariable(d9);