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When selecting 4 columns in a grid, a 5th 'phantom' column displays

I’m currently in the process of recreating the Hayes Valley Interior Design website in the ‘Freelance Web Design Bootcamp’ course. I’ve been having issues with the grid. Whenever I select 4 columns, it displays a 5th ‘phantom’ column that I can not delete. When viewing the attached share link, the grid has 4 columns and displays correctly. However, from the screenshot on my editor, it has 5 columns. Please help!


Screen shot:

Here is my site Read-Only: Webflow - Hayes Valley Interior Design
(how to share your site Read-Only link)