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LM25149-Q1EVM-2100: output voltage ripple

Part Number: LM25149-Q1EVM-2100
Other Parts Discussed in Thread: LM25149-Q1

When I measured the output voltage ripple on the LM25149-Q1 EVM board, I found that the ripple is shown below and is not a standard triangle wave like in the user's guide figure 6.3. The operation follows the user guide exactly, with the oscilloscope using AC coupled 20M bandwidth and the probe using ground rings on the output capacitor C28/29/30/31. Input 12V, output 5V 4A. What is the reason for this square wave? Thank you ~