I'm not on IP, but in my own experience I often stall or even gain during TOM even if I am totally on plan. It's fluid retention.
So if I hang on for the TOM week and then an extra couple days I usually see like a 2 lb drop on the scale. But it's kind of a psychological game to remember and BELIEVE that it's not fat gain every month. Especially when I'm hungrier and have more cravings.
Around TOM, I try never to skip or delay a meal. If I do, it makes me eat more.
You seem to be doing great! I wouldn't worry.