Keep receiving error when dragging content into Collection Item

[SSM777 (CR)]

I am new to weblflow and I’m following along with the Webflow skillshare course to create the Tile Design Template, found here: Webflow - Tile Design Template

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I am at the part where we drag the tile text and tile image from the Hero Tile of the 33 Block into the Collection Item, but when I drag the tile text and tile image into the collection Item, I get this error:

Drop this element inside the Collection Item element to add it to each collection item.

But how come the guy in the skillshare course dragged it and dropped it so easily without this error message? Where did I go wrong?!

collectionitem2|690x125

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Here is my site Read-Only: LINK
(how to share your site Read-Only link)

[vincent (Vincent Bidaux)]

You can simply copy them, select the Collection Item in the Navigator, and paste them inside.