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Hidden Sections on Preview and Publish

Hey Guys,
I bought this Devkit and I started assembling my website by adding different sections from different pages. I completed one page i.e Home and when I clicked on preview it showed nothing. None of the sections were visible just the footer and header. Even the published website didnt show anything. The interesting thing I noticed was the scroll bar. Somehow the content is there but not visible.

I cant seem to figure out the problem let alone the solution. Can someone please Help