[alephnil]

I don't have a place to upload a screenshot just now, but it's Firefox 135 on Fedora linux 41.

What happens is that the squares doesn't stay square like in your screenshot, but varies in size depending on which pieces are in that row. The height of a row varies, but the width of the columns always stays the same.

Edit: It is often not the lowest row that get hidden, often e.g row 4 and 5 get so low that you can't put any pieces there.