I think your body keeps producing amnio fluid, so even after your waters break, even if they did totally empty out, your body would keep making more. when mine broke, i had a gush with every contraction. i started wearing maternity pads, but after a while i felt like i was losing so much i felt that i would end up with wet pants, so i just stuck a beach towel in my DH's track pants (no, i was wearing them - not him LOL!) and some of the towel stuck out the front and some out the back! It was NOT a good look!!
Anyway, maybe when your contractions start it will start leaking more?? Maybe there was just a little break in the sack and the baby is putting pressure on it, so it's kind of pinched closed again??

GL