Facebook Like/Send Button - After comments

When I set the like/send (button appearance 1) to 'After the comments of your post', I see the send button, but when I click it the facebook window opens up behind the footer. This makes it impossible to add or edit content to the send box.
Any ideas please?
I did try having the buttons at the top of the page, this worked fine but doesn't look good at the top, so need to have it positioned as above.