The software must support KP Straight Line (Old) or KP New (Krishnamurti) Ayanamsa. Using Lahiri or Raman Ayanamsa will result in incorrect sub-lord calculations.
Before entering birth data, go to settings and select KP New or KP Straight Ayanamsa. Traditional Lahiri Ayanamsa will yield incorrect sub-lords.
Effective KP software should include specific technical tools required for accurate "stellar" analysis: Precision Calculations