I just downloaded the latest version of this and getting this problem in the site I added it on http://grab.by/yvjO. I do not like the styling or scroll down I have an older version and it opens correctly.
Also is there a possibility to have the form fields wording be customizable? In the USA Enquiry is a miss-spelling and my clients do not like seeing it that way. Hacking the code in the plugin gets overwritten with updates naturally.