1. Suggestion: Make some clean in your plugin folder. You have at least 4 copy of this plugin file.
One it is enough.
- Recommendation: delete (move) ALL and keep (reinstall) the last (4.0).
- NOTE: This will not solve your problem.
2. Analise:
- You have different high walls at the same level (300 at living and 365 at garage);
- Roof-gen level elevation is at 365 like the highest wall;
- The roof elevation is at 0 and belong to Roof-gen level;
- So the roof will appear in 3D at Roof-gen elevation + roof elevation.
3. Solution:
- If you keep the actual design you will have to set the Roof-gen level elevation at 300 and the roof will be in the correct position.
4. Explanation:
- The roof generator try to put the roof above the higher wall in the plan BUT it can't guess your mind.