well, it wasn't intentional, I was going off what i did last week, which was lower than today so I didn't think I could push it as much as I ended up being able to the last set. There is a lot of trial and error with NROL. Seems to take a while to find the true weight you should be lifting and know your limits-especially if you've just been pretty much a recreational weight lifter never really pushing it
I'd suggest that before starting your next program, take a couple of workouts to select your weights. I try to pick weights where I could do the prescribed number of reps + 1. So on a 4x10 protocol, I could do 11 reps in a set, but not 12. Based on that I've been adding 5lbs per dumbbell for upper body and 10lbs total for lower body exercises each workout.