Hey!
So I found an area to build my base and spent so much time leveling it out and mining the rocky ground.
Now every time since I finished, when I log on there's always a giant hole in the middle of my base and a giant mound near it.

I don't understand why it does this. Is it just a thing? Is there something I can do to fix it?

If you need a picture, since I can't post one, you can check out my profile. I just shared it publicly. Feel free to respond with an answer to the photo. Thanks!!