There is the possibility that you have restricted your kJ too much and the body has readjusted after an inital period of weight loss to conserve weight. Being hungry and or fatigued are good indicators of this.
Had you been doing something to your diet previously that meant that your water retention was low, ie low sodium foods or low processed foods? Some of your initial weight loss may have been water related and you have merely put water weight back on rather than fatty tissue.
I suppose the good news is that it can only be a limited number of things and it is easy for me to sit here and say ignore the weight number and concentrate more on your body composition, but im saying it
Slow and steady wins the race.