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TPS23750: The output voltage fluctuates between 1V and 5V

Part Number: TPS23750

I refrence the design of "TPS23750 Buck-Converter Evaluation Board",but can't get Stable output of 5V.And could not find why

this is sch

and this is err video

some detail info:

1.Q2  use NCE0110K TO-252-2 100V/9.6A NMOS.

2.R3 Parallel by1K(0805 1%) and 560R(0805 1%),the value is 358.9R

3.C9 use 100uf/63V

4.C14 use 0.22uf(1206)

What causes this phenomenon?

method to resolve the problem.