That's a case where you might need to pin your player's image to your player's box.
Sine movement from the behavior will happen after the treatment of the event sheet, and so your image already has been placed.
To be sure though, consider posting a link to your capx to make it easier to investigate your project. Perhaps the issue lies elsewhere.
As a new user you are not allowed to post links, although you still managed to
You may want to check this topic to earn enough rep to be allowed to post links.