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TXB0104-Q1: why the waveform of the device distort?

Part Number: TXB0104-Q1
Other Parts Discussed in Thread: TXB0104

dear TI guys,

my customer use txb0104 to occur the below issue:

the device is used  as voltage level translator for spi interface,vcca=1.2v, vccb=3.3v, the spi frequency is 3 MHZ,when the 3.3v side input a signal,the waveform of the 1.2v side  distort;  the waveform as below

the yellow waveform is 3.3v level,the green waveform is 1.2v level.

the application schematic  as below

            

can you tell why like this, follow the datasheet,the device can support 30Mhz signal,but my customer only use the 2MHZ signal.