Download form issue

Hi, we have been edocman for a while now to manage case studies and while paper on our site. However now we are trying to make use of download form feature of edocman, meaning before someone downloads any paper they need to fill out form with their name and email address. When we enable this feature, the form gets hidden behind the site in transparent manner. We can see the form only in background and when clicked, it just clicks on the webpage and not the form. I am attaching screenshot for same. Can you please help us with solution. Its on development site with no outside access. hopefully you can provide some solution through email.