flash creating a back button problem

Hello,I have a few pages in my course that has a flash animation on it. The previous page and next page buttons were created in lectora. When the user gets to a page with the animation, the animation will play. If the user hits the back button supposively it will take the user back 2 pages back instead of only going back one. None of the objects on the page are overlapping. This doesnt happen when I test it but I have a user in another city that insists this is happening and that they are only clicking once on the button.I have noticed that when testing the course in Internet Explorer I will hear two mouse clicks but I only see for me the page only goes back one page like it is supposed to. Any thoughts? Could this have something to do with the scripting/javascript that Lectora generates? Or individual user settings? any other possibilities?Thanks!