Recalculate normals after transformation

my bad https://en.wikibooks.org/wiki/GLSL_Programming/Applying_Matrix_Transformations#Transforming_Normal_Vectors_with_an_Orthogonal_Matrix

vector * matrix != matrix * vector
Inverting the position from (i* normalMatrix) to normalMatrix * i fixed the problem

    for(auto i: root.getMesh().getNormals()){
        cout << i.length() << endl;
        ofVec3f normalVector = (normalMatrix * i);
        finalMesh.addNormal(normalVector);
    }