Why does my webpage look different in the editor than on the actual site?

Here is my read-only link:
https://preview.webflow.com/preview/harker-deca?utm_medium=preview_link&utm_source=designer&utm_content=harker-deca&preview=3fbab97b5038baaa3558aae78bb816a9&pageId=664bb605dbddae0ead1ba041&workflow=preview
And here is the actual link:

If you navigate to the Summer Programs tab, you will notice that the layout on the desktop viewport is completely different than on the actual site. Can anyone help me fix this issue?
Thanks