iframe plugin not working correctly

I’m using this iframe plugin successfully on multiple WP 3.9.1 websites using various thmese without issue.
http://wordpress.org/plugins/iframe/

When attempting to you is with the HiEnd Theme, It stacks each iframe based content box on top of each other. In every other occassion, the iframe based content box will happily sit side by side, as show here:
http://phillycardco.com/ks-decks/currentkickstarter/

Notice how the iframe content boxes will sit side by side, 3 in a row.
On my new site, (the coming soon mode is on) It stacks the same iframe boxes one on top of the other.It’s a long column of single boxes.

I’m hopeful you can help.

WP ver 3.9.1
HE theme 1.2