Geometry Box disappears at certain locations

So recently I have been working on a project and I was looking over the level in the level editor and I noticed there are a couple of clips on some of the geometry blocks that make up the structure. I have tried moving the individual block in a different location and the block is solid. It is only when you move the block into that specific section, you can see through part of it. It doesn’t seem to be a programming error. I am worried about what has happened, If you know how to solve this problem please help, thanks.