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TCAN332: common voltage test, ACK is not normal

Part Number: TCAN332

common voltage test,3.3V power supply,common voltage :+3V,the connection is in figure 1 .

then I test CANH,CANL and CANH-CANL signals with Oscilloscope,I get figure 2 ,green is CANH signal ,

blue is CANL signal,yellow is CANH-CANL. The receiver  overwrite the recessive ACK=1 , I find ACK  is a little

 strange,why CANH fall down ?