Sidebar Positioning/General Layout issues

I am using the latest version of WordPress and Buddypress together, which is mostly working great. I have created a custom theme that includes a right sidebar, which looks and works fine on all pages that I create myself, however they drop down below the content on pages that are created by both Buddypress and when I search for something.

See examples here:
https://theseattlevineproject.com/?s=art&submit=Search
https://theseattlevineproject.com/members/eckstein/

Also, on these pages, it seems like the margins and spacing is completely different from my other pages. No matter what I’ve tried to change in the CSS I cannot get it to work, which means I probably need to do some PHP editing (which I am not very good at).

I have tried disabling all plugins one at a time, and nothing has worked. And it has nothing to do with my floating sidebar, as I just added that a week ago and the issue has persisted since I launched the site a month ago.

Can someone help me figure out how to fix this?

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