[Theme: Brunelleschi] widgets/sidebars

I installed this theme on two sites. On one site, the theme looks fine, and on the other, all the widgets, content, and everything is gone to the left one on top of the other even if I choose the sidebars to be on the right side.

I have used this theme several times before and this is the first time this happened. ?? Any suggestion?

https://www.ads-software.com/extend/themes/brunelleschi/

[ Please do not bump, that’s not permitted here. ]