If you're experiencing the blood bug in Terraria Overhaul, where the blood moves across the screen instead of staying on the ground or other blocks, and gets stuck on the screen, you can fix it by changing the settings in the configuration file.

Follow these steps:

1. Go to the following path:
```
C:\Users\(Your username)\Documents\My Games\Terraria\tModLoader\TerrariaOverhaul
```
2. Find the `Config.toml` file.
3. Open it with a text editor.
4. Look for the section `[BloodAndGore]`.
5. Find the line `EnableDecals = true` and change it to `EnableDecals = false`.
6. Save the file and restart the game.

This should resolve the blood bug issue.