Columns are collapsing regardless of viewport width

A few weeks back, my siteorigin widgets stopped displaying side by side, despite being arranged that way in the page builder.

I saw a recent thread mentioning front-flex.css – I couldn’t find this in the plugin directory, so I added it, and it hasn’t seemed to fix the issue.

I have created a page on the site to showcase this: https://www.cryoserver.com/siteorigin-test/

Any help would be appreciated!

Ollie