Threejs OBJLoader'd mesh appears to have incorrect vertex ordering

I'm using OBJLoader to load an OBJ file into my scene.

For whatever reason the vertex ordering seems to be out of whack.

Here is a pic of my model in blender:

And here is a pic of my model in three:

I've seen similar effects before with models and it's always been due to vertex ordering so I make the assumption something is going wrong there.

EDIT By the way, notice the triangles crossing over the letters where in Blender there are none. I believe there may be an offset in the vertex count introduced somewhere.. maybe.

The code:

    const mtlLoader = new MTLLoader();
mtlLoader.load('./test.mtl',
    (materials) => {
        materials.preload();

        const objLoader = new OBJLoader();
        objLoader.setMaterials(materials);
        objLoader.load(
            './test.obj',
            (object) => {
                scene.add(object);
            },
            (xhr) => {
                console.log((xhr.loaded / xhr.total * 100) + '% loaded');
            },
            (error) => {
                console.log('An error happened');
            }
        );
    },
    (xhr) => {
        console.log((xhr.loaded / xhr.total * 100) + '% loaded');
    },
    (error) => {
        console.log('An error happened');
    }
)