Using a Grid Row creates a strange line and div underneath

Hi there. I am working on a page design that uses your Grid Row feature. However, any time I do so, it creates a gray horizontal line below the section, and a large amount of padding after. How do I make it not do this?

You can see the issue on this page – https://www.shamanism.com/programs/dance-deer-ceremony-pacific-cultural-center

Please look in the area between the “journey into your heart” section and the grid of images below (tribal drumming, indigenous ceremony, etc).

Screenshot: https://shamanism.box.com/s/g2xwxos4dalsfhfspxq49mp1lyvj4p13

Thanks!