Posts not displaying in proper descending order on grid format

hi, hope this finds you well,

i’m using the grid page format, choosed ‘Order grid items by: Descending’ and the posts are not following the horizontal left-to-right order, but the vertical top-to-bottom instead.

also when i click the ‘load more’ button, it mixes this post order.

any help?

thanks.

The page I need help with: [log in to see the link]