CCS/TMS320F280041: TMS320F280041 I2C Communication Problem

Tool/software: Code Composer Studio

Hello,

I am using F280041 Controller as slave receiver. I am using receive FIFO ISR For receiving the data.

Msp430 device sending eight byte data on I2C Bus at every 4ms . 

The problem is some time the data of buffer inter change with each other means first receiving byte goes in to Second Buffer and Move On. 

I am not under standing How Is it Possible????