Hi Ofi,
I'm having issue with my Monosnap and I cannot upload my screencast.
Anyhow, please try to add an IG add-on to your page then set the Item Limit to 6 and per row is also 6 so the layout should show 6 photos in 1 row. Now Save. While in the editor, the layout looks good - 6 photos in 1 row but when I do a preview or looking at the page, the layout will show 2 columns and 3 rows.
I am also running with nginx and Php 8.0, if that matters. During the beta version, there are a lot of layout discrepancies caused by PhP version. I think you guys need to drop Php v7.x support with SPPB v4.x or mainly it should support Php v8.x first.
Thanks!