So bascally 4 "high intensity" workouts a day and very little food. I'd say prob overtraining.
I think definitely not more than one HIIT workout and one weight workout. What are you doing so wrong in your first one you feel you need a second?
However you did say the weight was coming off. So I wouldn't obsess about it. Really fast weight loss isn't always so great anyway. Much more likely to put on the weight quick again. Slow and steady is good.