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LM2735: why lm2735 SW wave shaking

Part Number: LM2735

Hi Team,

When I tested LM2735Y 5-pin SOT23 Demo Board(https://www.ti.com.cn/tool/zh-cn/LM2735YMFEVAL), input is 4.5V, output is 12V, load is 300ohm resistor, and when I tested the SW wave:

it shaking always, but when I stop the scope:

it`s waveform is quite good, the control should be stable, as I do not change anything of the EVM, and input and load are typical, would you help to comments, why SW wave is always shaking?

Thanks very much.

Regards, Sunny