Story not displaying properly when published on client's computer

I've written a storyline project which I've updated three times and after each update I've emailed the project to a client (a large UK University) and they have successfully published the project on their Articulate system.  However the fourth update which I have emailed to them is not displaying properly when published on their system although it looks fine on mine. Some of the objects overlap text boxes and the formatting is significantly distorted when viewed on their system.   I don't recall changing any of the player settings on the fourth update.  Any ideas about what might possibly have happened. Thanks, Jon