Hi Leslie,
Marketo form templates can be a doosy! The reason you are seeing a difference between the desktop and mobile views of the page are because the page is written using absolute positioning (css).
Generally, absolutely positioning elements is reserved for specific cases to control the content, and IMO as a web developer, should never be used to construct a page such as Marketo has.
For solutions.. there is no easy answer unfortunately. The way Marketo templates are setup, you have to do some serious rejigging to make the template flow on mobile and desktop (probably easier to rewrite).
Best,
Erik