WooCommerce and Atos Sips Gateway

Hello,
I use WooCommerce & Atos SIPS gateway 1.0 to make working credit card payment.(MERCANET – BNP PARISBAS). My problem : once I clicked on PAY, instead to see the page with credit card logos VISA/MASTERCARDS, the page scroll up and that’s it. Someone knows this problem? I don’t know what to do or to try. Can you help me?

My configuration WP is
– WordPress : 3.6
– PHP/MySQL : 5.1
– Theme: WooTheme SWATCH 1.1.5
– Plugins : WooCommerce 2.0.10 – Atos SIPS gateway 1.0 – Woosidebars – woodojo – Nextgen Gallery – CFORM 14.6 – ALL IN ONE SEO
– Hoster : ovh
– Website : esgolf.fr

Thanks,
Laurent