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TPS56121EVM Bode Plot at 1.5A Load

I took the Bode plot of TPS56121EVM at 1.5A load condition. Input voltage is 12V. And I used FRA5087.
Please refer to the attached file. The bode plot phase curve of 1.5A rapid leads and phase leads 360 degree. Our customer concern that this is not stable.
Can you say this bode plot is stable? If it is yes, please let me know the reason.
I took Nyquist plot too, then please refer to the those too. About nyquist plot, positive and negative is displayed inverted.

And could you tell me the cause why we can observe this bode plot at 1.5A load?

TPS56121EVM_Bode_Nyquist Plot.pptx

Best Regards,
Kohei Sasaki