Did you make any changes to any of the stacks? I just created a new stacks page, placed a Column stack (with 3 columns) on the page with a Social Badges stack below. I then added a Display stack to each of the columns and a Paragraph stack into each Display stack. It previews fine. All stacks still have their defaults, except Columns where it’s now set to 3.
I wonder if this is a Stacks issue. My tests are with RW 8.7, Stacks 4.1.4 and the latest Foundry v2 stacks.