Finger positions of kinova arm does not update in RViz

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Dear ROS community,

I am using kinova-ros package installed from source (kinova-driver release 1.2.1). The finger positions of kinova arm does not update in Rviz.

But both joint_state and finger positions topics are published. And I am able to controller each fingers with the script "fingers_action_client.py".

rosrun kinova_demo fingers_action_client.py j2n6s300 -r -v percent -100 -100 100

Tf is intact.

snippet of topic /j2n6s300_driver/out/joint_state

name: ['j2n6s300_joint_1', 'j2n6s300_joint_2', 'j2n6s300_joint_3', 'j2n6s300_joint_4', 'j2n6s300_joint_5', 'j2n6s300_joint_6', 'j2n6s300_joint_finger_1', 'j2n6s300_joint_finger_2', 'j2n6s300_joint_finger_3']
position: [4.357342735441942, 2.9764899818103308, 0.8698737663328161, 3.9588342341413187, 1.6252170915642843, 1.3924464259631075, 0.012781970648700604, 0.012063306225569713, 0.012268638026209425]
velocity: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
effort: [-0.21822483837604523, -0.0, 0.003679371438920498, -0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

snippet of topic /j2n6s300_driver/out/finger_position

finger1: 62.25
finger2: 58.75
finger3: 59.75
---

Arm model: j2n6s300 rosversion: Kinetic