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TPS2372-4EVM-006: TPS2372-4 RTN not driving to VSS

Part Number: TPS2372-4EVM-006
Other Parts Discussed in Thread: BOOST-PSEMTHR-007, TPS23880EVM-008, , TPS23880, TPS2372

I'm running TI demo boards together to start developing my own PD design.

TPS23880EVM-008 & BOOST-PSEMTHR-007 (powered by 53V DC supply)

RJ45 to:

TPS2372-4EVM-006 (loaded by 120 Ohm resistive load)

I've tried the 2 pair and 4 pair ports. The TPS23880 EVM software recognizes theTPS2372 and the correct class I set it to, but the TPS2372 drives the RTN to about 10V (relative to VSS). I've tried different Class settings and changing the AMPS_CTL and MPS_DUTY.

Can you provide any insight into why this could be happening? I was thinking this would be the easy part of the design.