Left sidebar gone

Hello everyone,

My page layout is content-sidebar, so that right sidebar is on top and left sidebar is below, both on the right side of the screen. Left sidebar is just gone after I refreshed the browser during one of my edits. It doesn't matter what widget I place inside the "left sidebar" space on my widgets page, it just doesn't show up on the front-end anymore.

I am using GP's child theme.

I tried everything.

I had both sidebars on the right, just like the blue boxes on this page:

https://generatepress.com/forums/forum/general-support/

but now one of them (the left sidebar) is gone.

Does anybody here know what it could be?

Thanks.

Daniel