Download Manager issue

Hello
I have been using this plugin on my website.
At the same time, I am using the connections directory plugin.
But this download manager is creating some issues.
Can you please check the issue and help me both of my plugins can work properly.

my page link is: http://www.wasd.org.uk/network/join-expert-directory/

The page I need help with: [log in to see the link]