DirectInput question

I made a 2-player game in which one option is to let both players play with the keyboard. But when both press about 2-3 keys at once adding up to 4-6 keys down one key press is not processed. I used immediate and buffered mode. In buffered mode i use the following to get the state data:

int i;
DIDEVICEOBJECTDATA didod[24];
DWORD buffsize = 24;
lpDevice->GetDeviceData(sizeof(DIDEVICEOBJECTDATA), didod, &buffsize, 0);
for(i = 0; i < buffsize; i++)
{
	if(didod.dwData && 0x80)
	{
		keys[didod[i].dwOfs] = TRUE;
	}
	else
	{
		keys[didod[i].dwOfs] = FALSE;
	}
}
 

Then: if(keys[DIK_UP]) { //do stuff } if(keys[DIK_DOWN]) { } and so on... normally its in a class i just did it like this to show I need help desperately. Whwnever player one moves right + up then player 2 cant move right + up! -CProgrammer