LMH5401: Negtive gain question for cascading LHM5401 with DC coupling

Hi experts

How are you?

I am trying to design a two stage cascaded amplifiers to get desired gain with 3dB bandwidth of around 800Mhz

LMH5401 is the FDA chosen.

Circuits used are from reference design TIDA-00659.

The cascaded amplifiers also acts as a single end to differential convertor to amplify signal large enough and feed to a post amp.

Resister values in the circuit are calculated from “TI FDA Calculator.xlsm.”

The simulation tool used is TINA-TI for verification.

In case of AC coupling between LMH5401, I can get about 60dB for the entire chain.

Below figures are calculated resistor values from “TI FDA Calculator.xlsm,” schematic and plot from AC transfer characteristics.

However, in case of DC coupling between LHM5401, I am getting a negative gain.

Below figures are calculated resistor values from “TI FDA Calculator.xlsm,” schematic and plot from AC transfer characteristics.

I was wondering if some of you can shade some light for me why I am getting negative gain?

Thanks to you all for the help in advance!