Job well done!
A couple of things come to mind...
Maybe you are at your ideal weight? It's hard to know what is a healthy weight, esp for those of us who have been overweight for a while. When I did IP, my coach encouraged me to pick a lower weight than was right for my large-boned frame. There came a point when I just knew it was time to phase off.
Sometimes the metabolism gets sluggish from the caloric restriction. It's counter-intuitive but you might try adding in some extra protein or a lower calorie, non-restricted packet. My coach advised some people to add a packet to get out of a stall, esp those who were exercising.
But as said above, it might just be that your body is taking a pause & adjusting.