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Grid displays weirdly in editor

Two questions…

Problem 1:
The grid element on my site sometimes adds an extra column in dev mode that disappears in preview. Why is this? I’ve ran into this a few times.

Problem 2:
I’d like to make the BG video to span 2 columns instead of three. Where do I grab the element if I now want to change the span, to two columns for example?

Link to page: https://preview.webflow.com/preview/portfolio-5621b6?utm_medium=preview_link&utm_source=designer&utm_content=portfolio-5621b6&preview=93c12282b53ae30ffceec57e336b84eb&mode=preview

Here is how you do it.