Model UVs don't align to texture in blender

[Random Talking Bush]

In cases like this, you need to double the horizontal canvas size of the diffuse texture (in other words, 256x256 -> 512x256), and fill that with a mirrored copy of the texture to match how the normal map looks. Should look something like this if done correctly:


Not every texture needs to be mirrored, though, so use the normal maps as a reference point -- if they're symmetrical and the diffuse isn't, apply the method above.