This is a weird issue, I have been looking for ever but I could never really think of a name for this. I have been trying to fix this for about 3 days now, and when this did happen, I undid everything I did in radiant, even tried going to an old part and all and I have not been able to fix this. This isn't the first time this happened, this actually happened on another map I released.

Now I just got this new computer because my previous one crashed and it was cheaper to get this one than fixing my other one so I have had to redownload and resetup everything, and I am unsure if it is a problem or a setting.

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(Above vid is unlisted so you may need to manually launch the link)
https://gyazo.com/8088e4479b2675983df39ad0282f98c4 (<--- Is a gif)

I really am stumped on how to fix this, and as you can see if I cant fix it then either I release it with a phantom map intercepting with the play area or I scrap this map and work on a new one

Radiant screenshot: https://gyazo.com/cff069a3c4d3ea25cecf99a05d1678f0
In-game screenshot: https://gyazo.com/7cd036682642754537c87f672b3accbf

I plan to spend some time on this map with proper cave systems and maybe (if I watch alot of youtube tutorials and ask from the best) I want to have some cool mini eastereggs to mess around with.

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I don't wanna scrap it because I have wanted to build a minecraft style map, and I have spent ages getting the brush sizes right and the textures to fit properly.

Any help at all is appreciated
- PlutoBro