Webench/LM5116: what is wrong with my LM5116 Borad which designed by webench

Part Number:LM5116

Tool/software: Webench

My  LM5116 Borad which designed by webench ,24 input ,12V output ,but the peak to peak of Lm5116 20 pin is too high,who can help me ,what case that and how can i solve.

sch,pcb,and wave picture I put on the attach,thank you.