problem with Mac Layer on ZStack

HI dears at TI
I don't know whats the matter with this forum,

it really takes time to reply.

I want to work with Mac Layer on ZStack,

this function :

void MAC_CbackEvent(macCbackEvent_t *pData)

this function receive the packet when the transceiver receives it.

it works ok,just with two problem.

1-when device wants to transmit data,the echo or sth like this accrues , and I receive the sending packets in this functions.

2-some times,when new packet arrives,it has prevoise packet information,src mac/rssi and .. some other property from prevoise packets.

I used         mac_msg_deallocate( (uint8 **)&pData ); but still no difference.

any one here to reply and help me ?

Thanks a lot