If the Harness is pushed to the back of the Ring, foot movement will result in backward motion or strafing. Ensure that the player is not inadvertently pushing the Harness back in the Ring while trying to walk forward.
To accommodate bigger users, select the “Forward Only” mode in the Advanced window of Omni Connect. “Forward Only” mode disables strafing and backward movements, and translates all movements of the player to “Forward”. Find more information about “Forward Only” mode here.
Also make sure the Ring cable is connected between the Ring and the left Tower and reset the game.