I found a typo from isaac sim wheeled_robot.py

def get_wheel_positions(self):
“”“[summary]
Returns:
Tuple[float, float]: [description]
“””
full_dofs_positions = self.get_joint_positions()
#original code with typo
#wheel_joint_positions = [full_dofs_positions[i] for i in self._wheeled_dof_indices]
#fixed code
wheel_joint_positions = [full_dofs_positions[i] for i in self._wheel_dof_indices]
return wheel_joint_positions

Hi @chr0430 - Thank you for reporting this. We are looking into it.