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TPS62811-Q1: Unstable switching waveform at PSPICE model

Part Number: TPS62811-Q1

Hello Expert,

I observed unstable switching waveform as you can see below.

There is extremely short pulse as like as few ten ns.
This waveform is observed when I changed FB resistor network and load resistance from default file to achieve 3.3V 1A our as below.

Would you tell me why this issue happened and how to fix it?

I confirmed same condition at SIMPLIS just in case and result is stable as I expected.

Best regards,
Kazuki Kuramochi