Position CHANGE after publish

Hi gyus,
My case: Top layer I put a rectangle graphic symbol & the layer below is a gif image, the position of my rectangle graphic symbol is exactly fit what I want to match the gif image underneath in 100% view in my fla working space BUT the position of my rectangle graphic symbol CHANGED (move up/down/sideway) a bit after I publish/preview my movie. As a result, I find it hard to position someting needs accurate positioning…

Anyone came across the same problem/could anyone give me some solution??

Thanksss

Tom