List Builder Form appears below the fold

Although it was OK to start with my List Builder form appears half below the fold on my website which means the visitor can input their name and email, but the Submit button is not accessible.

http://screencast.com/t/ckhjTpHp

I Deactivated Sumome for this reason, but tried it again when I noticed there had been an update. However still the same experience.

Is anyone else having this is and is there a solution?

my site is http://www.customology.co.uk

Thanks

https://wordpress.org/plugins/sumome/