Updating Staff Pictures

We just had some changes in our company staff and I’ve been tasked to update the Staff page on our site. When I did so, the pictures are no longer in alignment. They should be five across for each “grouping” but they’ve gone haywire. I’m VERY new to Word Press and I can’t figure out what I’ve done wrong. Any help is appreciated.

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