Mobile Landing Pages

Hello,

I am having a really hard time designing these new landing pages from the mobile standpoint.

This will be for a Facebook Ad, which is largely viewed from a mobile device. But, when I design the landing page from a mobile standpoint, it looks nothing like the actually landing page that is published.

Any ideas on how to fix this? Or, at this point, since it is relatively new, is it something that I need to live with?