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eCan receive problem

Hellow,

        I am programming eCan between two boards of 28335, but now I encountered a strange problem, in the program I used the interrupt for sending and receiving the message, for the board B the program is running correctly, but for the board A,the situation is not optimistic, the problem is as the image shows:

The first picture is the correct one (board B), and the rest one is board A (Mailbox1 is the receiving mailbox for two boards), which appeared a strange problem; it receive so fast and the message received is always change in a increasing order ( I send a constant   Uint32 send_data_L = 0x76543210 ; Uint32 send_data_H = 0xFEDCBA98; ),  the program on two board is almost the same one, why it appeared such a strange problem?

Can someone help me?

 Thanks.