Sometimes, the page doesn't always distribute content as nicely as you'd like. Here are tricks you can try to get better distribution.
Add blank lines at the end of the last article on the page
By adding some blank lines to the end of the last article on the page, it forces the page to reshuffle and often results in a more desirable layout. These blank lines will be remove on mobile devices, so won't result in a big blank space.
Toggle between 3 and 2 columns
Sometimes, if a page is not looking desirable in a 3 column layout, it may look better in a 2 column layout (and vice versa).
Adjust heights of galleries and videos
If there are galleries or videos on the page, sometimes slightly adjusting these can resulting a more desirable look.