I would say your going anything 'wrong'. Your metabolism can plateau which means it gets used to what you have been doing exercise wise, and now knows what it needs to burn off.
Try some cardio work then things like squats, or step ups, burpies (these hurt, but work)
There are some amazing blogs and you tube vids of PT's who can show what's worked for others.
I've had had two close friends loose over 30kg each, over the course of a year, and only now are showing shape.
Good luck!