I think there might be a bug with the Finsweet slider. When you place it inside a grid, it causes an overflow that makes the page grow.
On desktop, setting the column to max 1fr / min 200px works fine, but if it’s just 1fr, it breaks the page layout. On mobile, this doesn’t solve the issue either—there needs to be a flex div, otherwise, there’s still an overflow.
I’ve also gotten this. Whenever the next or prev button are pressed, overflow happens during the animation, then disappears after. Very annoying because it shifts the entire element up and down.