Questions about Face_ControlBoard_CrtlRig forward solve and backward solve not corresponding

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When CTRL_C_jaw_fwdBack is -0.2, first pass the Forward Solve to obtain CTRL_expression_jawFwd of 0.2 and jawBack of -0.2 respectively. Then after passing the Backward Solve, I got a CTRL_C_jaw_fwdBack of -0.4.
Did I miss something?