Sound and image delayed during edition

I think this app is easy to use and manage many formats. The problem is that during edition of movies (in my case, .MOV), sometimes the sound track does not match the image (there is a time delay of few seconds), which can be VERY annoying because it makes very difficult to cut parts of the movie appropriately. After exporting the edited movie, the time delay just disapears and image and sound do match again...

Rqalbuquerque about iSkysoft Video Editor, v5.0.0