Slow Leakage? Is this Normal??

Hi! Well I went in for my second fill today -- had a first fill of 1.3 cc's a little over a week ago. When she put in my second fill, she noticed that I only had about .5cc's left in there!! So, where did it go!!? She told me NOT to jump to the conclusion that I have a leak yet because evidently this is pretty common (about 50% ) in her patients between the first and second fills. And it's been noted in the medical journals/conferences -- a mysterious disappearance of the first fill. Some people think it has to do with air bubbles being left in your band after surgery... I've heard some people talk about osmosis, dehydration, etc.??? I'm trying really hard not to freak out and worry that I have a leak. When she put in the fill today, she ran three "tests"... injecting it and then pulling it back out again, in order to confirm that the same amount was still there... and it WAS! (thank heavens!). So, at the very least, it's not a major leak...

Anyway, she filled me up and I think I'm feeling restriction for the first time ever... my question is, has anybody gone through the same thing or have any information about the possible causes of leakage after the first fill?? What's the deal with "osmosis, dehydration, etc"?? Thanks!!!