Describe the bug
The structure is floating. Is antigrav a thing?

Maybe the structure generation is looking for the highest non-air block and found the tree?

To Reproduce
Steps to reproduce the behavior:

1. Walk around
2. Be rather surprised

Expected behavior
Building should be spawned touching the ground.

Screenshots

please complete the following information:

• Forge Version: 2847
• Mods [e.g. mekanism, optifine]: too many, i can provide a list if needed
• MO Version [e.g. 0.7.4]: 0.7.9