Layout design changes in preview from editing window

Hey guys,
I am new to this platform and having some problems.

  1. When I design a website everything looks perfect but when I see the preview most of the objects don’t look the same, their position and size changes
  2. Same thing happens in mobile screen

any help will be much appreciated
Thanks and have a nice day.

Hey Devient, can you enable your share link to your site mate to allow others to have a look at the backend also and help you out?

Thanks for replying,

Here is the link, please suggest few things to improve it.
Thank you.