Animation - polaris ranger wheels won't straighten out

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I'm trying to do a simple animation with the polaris_ranger_ev where it just takes two 90 degree turns. For the first turn, the front wheels turn appropriately but then once it's done turning and is just moving forward, the wheels don't go back to normal, they're still turned. At the second turn (opposite direction), the wheels don't turn like they did for the first turn.

I followed the Animated Box tutorial, here is the code that I am using:

public: void Load(physics::ModelPtr _parent, sdf::ElementPtr /*_sdf*/)
    {
      // Store the pointer to the model
      this->model = _parent;

        // create the animation
        gazebo::common::PoseAnimationPtr anim(
              // name the animation "test",
              // make it last 60 seconds,
              // and set it not to repeat
              new gazebo::common::PoseAnimation("test", 80.0, false));

        gazebo::common::PoseKeyFrame *key;

        // set starting location of the model
        key = anim->CreateKeyFrame(0);
        key->SetTranslation(math::Vector3(0, 0, 0));
        key->SetRotation(math::Quaternion(0, 0, 0));

        // set waypoint location after 10 seconds
        key = anim->CreateKeyFrame(10.0);
        key->SetTranslation(math::Vector3(0, 0, 0));
        key->SetRotation(math::Quaternion(0, 0, 0));


        key = anim->CreateKeyFrame(20.0);
        key->SetTranslation(math::Vector3(1, 0, 0));
        key->SetRotation(math::Quaternion(0, 0, 0));


        key = anim->CreateKeyFrame(30.0);
        key->SetTranslation(math::Vector3(2, 0, 0));
        key->SetRotation(math::Quaternion(0, 0, 0));


        key = anim->CreateKeyFrame(40.0);
        key->SetTranslation(math::Vector3(3, 1, 0));
        key->SetRotation(math::Quaternion(0, 0, 1.5707));


        key = anim->CreateKeyFrame(50.0);
        key->SetTranslation(math::Vector3(3, 2, 0));
        key->SetRotation(math::Quaternion(0, 0, 1.5707));


        key = anim->CreateKeyFrame(60.0);
        key->SetTranslation(math::Vector3(3, 3, 0));
        key->SetRotation(math::Quaternion(0, 0, 1.5707));


        key = anim->CreateKeyFrame(70.0);
        key->SetTranslation(math::Vector3(4, 4, 0));
        key->SetRotation(math::Quaternion(0, 0, 0));


        key = anim->CreateKeyFrame(80);
        key->SetTranslation(math::Vector3(5, 4, 0));
        key->SetRotation(math::Quaternion(0, 0, 0));

        // set the animation
        _parent->SetAnimation(anim);
    }