The height checkbox is checked for this Hype document -- this is gonna give you a bad time, since you're placing your OAM inside of a container with no height. So the height is going to try to be 100% of "no height".
Please check the 'Responsive document tips' section on the Plugin page here for workarounds. This one might be perfect for the type of document you're working with: Creating a Flexible Tumult Hype Document within a DIV with no set 'height'