Creating a new Open World Level uses a custom landscape from a different project?

I am having the weirdest experience ever. Never tried anything like it. I don’t know how I managed to create this issue and I don’t know how to fix it.

I have an imported custom landscape fully setup, but I wanted a testing ground level to test things instead of doing it in my custom level. So I created a new Open World level, expecting the default landscape, but instead I was met with my custom landscape. After trying to fix it, I gave up and instead created a new project to create an open world level and then migrate it, but to my surprise the issue persists throughout all my projects. The same exact custom landscape.

How the hell did I manage to do this?

When you open the new level, the Landscape Heightmap Import might be automatically populated. Check that. I think I’ve seen this before.

Yeah, I thought of this as well, but doesn’t seem to be the case. I recently found out that it seems to be the open world template only. Even If I open a level that was created using the Open World template, waaaay before I even started my project, has changed to another landscape.
The custom landscape is also quite huge, but creating a new open world level takes but a second, making me think that the landscape already exists somewhere and is somehow being pulled. IDK how it works.

Thanks for your answer though. I appreciate it.