Me too!
I’ve just logged in to the designer and noticed the grid on one of my pages was messed up. When viewing the site in a browser it looks ok, but when editing, the grid becomes super long.
Couldn’t upload the video here for some weird reason. Pic 1. Normal row of items/products with 1 wrapping on a second line.
Pic 2. Inside editor the collection list / grid becomes huge in height (goes on forever haha).
Weirdly, when I limit the collection list items to display only 5 in the row it doesn’t do it. But I never had to limit them before for it to look ok.