This is because the 4th house is related to your mother and your native place.The 4th house also represents your assets in terms of your property, house, etc.; depicts the inner securities that you may carry because of the conditions you live in; and provides an account of the principles...
If you were born with Pluto in Virgo, then your natal house is Virgo (Kanya Rasi) and during transit, Rahu or Ketu forming conjunction (in Virgo), sextile (aspect of 60° which are Cancer and Scorpio in this case), square (aspect of 90° which are Sagittarius and Gemini here), trine...