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TPS51220A test waveform issue

Hello,

         Below is customer schematics. The test waveform looks have problem. 5VSB and 12VSB output voltage will be ladder while 19V input. Do you have any comments or method to solve it? Thank you. 

Schematics

https://drive.google.com/file/d/0B4htKR16pRs8TzF0RGJIZWstN28/view?usp=sharing 

BR

Patrick