Hi StevanJay, thanks to your detailed description how to reproduce the issue I was able to reproduce it myself immediately and found the culprit: This seems to be a bug where the min-max y-offset is applied twice when spawning on meshes. When the value is the same for min-y & max-y, this results in the duplication of the y-value that you are seeing. This will be corrected in the next GeNa update, you can do two things to fix it for now: 1. Adjust the min-y and max-y to compensate value when spawning on meshes. 2. Open the file Assets\GeNa\Scripts\Spawner.cs and add to forward slashes // to the line 1222 in there. The line should now read: Code (CSharp): //newLocation.y += m_randomGenerator.Next(res.m_minOffset.y, res.m_maxOffset.y); Then save the file. This should fix the issue until the update arrives.