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TPS7A49: TPS7A4901 Input & Output voltage hump

Part Number: TPS7A49

Hello, I have a challenge about the phenomenon that occurred during experiment.(Vin = 5.5V , Vout= 5V)

I tried to find the difference when i change soft start capacitor. And the experiment was successful.

However there were some happening. When we opened the Css, There is no hump at the graph.

(Css=open , ILOAD=150mA)(Yellow: Input voltage , purple: output voltage, green: Vss)

When we placed 100nF soft start capacitor, there is a hump at input voltage.

(Css=100nF , ILOAD=150ma)(Yellow: Input voltage, Purple: output voltage, green: Vss)

So we tried to float them again to find the hump more distinctly. And we could find the hump both of them

(Css=open, ILOAD=150mA)(Yellow: output voltage, Purple: input current, Green: Input voltage)

(Css=220nF, ILOAD=150mA )(Yellow: output voltage, Purple: input current, Green: Input voltage)

I wonder why this hump happening.

Thank you.