congratulations on losing all that weight!
i would say right now, your body might be comfortable with the weight that its at. Sometimes people do plateau, so try to switch up your workouts to send your body into shock!
also, are you on a calorie defict diet right now? if not, thats a pretty sure way to lose weight...
but of course, as i always say, try not to focus on the scale so much. numbers on a scale are sooo misleading! instead, take your measurements, thats what i do, and its helped me a lot! :)