Leaning with off hands on any side means one or all of the followings:
1 - Non aligned rear and Front wheels (Minor Problem)
2 - Ainak (T) of front Shocks non aligned (Will need dentors help to fix this)
3 - Wrong or no matching Damp of Front Shocks (One is little Soft/Hard then other one - Major problem = Shocks Service + Pair of spring replacement)
5 - Rear Fork non aligned (Will need dentors help)
4 - Bent Frame = Factory manufacturing Fault or Accident (Fatal Problem -Can be fixed with only professional Dentors help or sale the bike or live with it).
Note = Ask some friend to Ride it with off hands (offcourse who knows how to do it if u dont want to screw ur ride) and ask if he faces same leaning issue on same side too to make sure its not only you who notices the issue.
Hope that helps.