The bode plot is involving a number of questions.
- You are apparently simulating a switching regulator in frequency domain. How? Does the simulator generate a continuous-time equivalent circuit? Otherwise it's just erroneous.
- I presume, the diagram is meant to show the loop gain. How do you measure it?
- What's the converter's switching frequency?
- At first sight, there's no impact of an output filter in the bode plot. How is it possible?
Needless to say, that the right half of the bode plot is meaningless.