Seems to install but not working properly?

Problem/Motivation

I've installed it on a D10.2.3 with bootstrap5 and layout builder.
In order to avoid Media Library Theme Reset I've first installed Layout Builder iFrame Modal and then the patch for Bootstrap Styles and then removed the Theme Reset module (like here: https://www.drupal.org/project/bootstrap_layout_builder/issues/3325151 🐛 Media Library Theme Reset not supported Needs review and https://www.drupal.org/project/bootstrap_styles/issues/3325150 🐛 Media Library Theme Reset not supported Needs work ).

It worked, it installed but it looks odd.
When I add a bootstrap section, it looks "broken" on the admin side.
Please check attached screenshot.

Steps to reproduce

Install, without Theme Reset and add a section

Proposed resolution

I only I'd know ...