While writing few hindi characters (Using Mangal font), then it is not showing correctly:

These characters displaying in attached image of pdf:

बिक्री कार्य हेतु => Bottom Left Position  
द्रण निष्चय => Top Right Position  
आकृति विशिष्ठ प्रयोजना => Top Left Position

Check the image for above characters

Please help to resolve this issue.

I have tried multiple ways to write but not able to fix this.