CMSMasters Content Composer [cmsms_html] modifies my HTML

I know I should post this at CMSMasters support BUT our previous Webmaster fell off the face of the earth and we can’t find our license information.

I need to add a Paypal button that has a dropdown list box. I got the HTML from Paypal and it works fine in a pure HTML test page. When I try to use the Custom HTML [cmsms_html] short code on a page that was built using the CMSMasters Content Composer it modifies my HTML to a point where it does not work. Anyone run into this? Anyway to turn the modifications off?

Thanks