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TPS92692-Q1: TPS92692 Sepic conveterter MOSFET Switching issue

Part Number: TPS92692-Q1

Tool/software:

Hi,

I am working on sepic conerverter design for below spcification.

Vin 8V to 16V

Vout 21V

Iout 0.75A

Fsw: 400KHz

i am checking MOSFET drain waveform from 8V to 16V. Till 13V VDS signal is ok. when i cross 14V VDS start to double switch again.

attached waveform for the same.

pls suggest what could be the problem in my design.