BSP/Geometry Brush Problem

Good afternoon!

I was having some trouble using geometry or BSP shape. When I started working on the project, the geometry shapes worked fine until I copied and pasted multiple geometry brushes at the same time. It stopped working properly after that. Whenever I place a new geometry shape, some part of the level disappear in a weird way. I

I looked into YouTube, but found nothing about this issue.

I am using Unreal Engine 4.24

Thank you for your time!