Where are you specifying 3 columns? Using Weaver’s multi-column option? Or Siteorigin
I would suspect that Weaver’s content-3-col class is not compatible with a sitebuilder.
If not, then your issue likely lies with how you’re using Siteorigin.
I really coudn’t figure out just what was supposed to be happening with the 3 different bg colors on our site, or how you generated those.