Column code not displaying right on iPhone

Working on a client development site (https://orrsrocks.wpengine.com), but this issue appears in multiple client sites with multiple themes.

Working with Shortcodes Ultimate inside of the footer widget. When I use the [su_column] settings, the columns appear ok on desktop, but they always end up not working on iPhones. They show up as distinct columns, but they are stacked instead of side-by side. I’ve tried making them very small (in case it was a width/content issue), but they still stay altered but stacked (see image: https://screencast.com/t/OvRglnpG0Pw).

Any thoughts on how I could fix this issue or create a workaround that would adequately show them side by side on mobile?

Thanks,
Jeff

https://www.ads-software.com/plugins/shortcodes-ultimate/