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WEBENCH® Tools/TPS544B25: Unable to find crossover frequency from Bode plot

Part Number: TPS544B25
Other Parts Discussed in Thread: TPS544C25

Tool/software: WEBENCH® Design Tools

I want to use TPS544B25RVFR part in one of our internal applications. As to get familiar with the part we started running simulations using TI Webench power designer. Our requirement is to generate 1V @ 15A current from 12V input. With this specification when we ran AC analysis a Bode plot showing unrelated magnitude and Phase curves (Magnitude curve not crossing 0dB) through which we couldn't find crossover frequency, Gain margin etc.
Surprisingly, this is not the case with TPS544C25RVFR which has given some expected data.
Here, i am attaching Bode plot with both cases, can yo  u please help us to get a better picture over them?