Lpc2000

We have an application where we use the GPIO I/O pins on Port 1 of 
LPC2138 to an LCV244 buffer/driver.  We found that randomly, some pins 
on the buffer driver were high or low at power-up with no program 
loaded to control the pins.  We added 32k pull downs between the 2138 
and the buffer/driver inputs to pull the lines low because the GPIO 
lines are floating inputs before program changes them into outputs.  
However, we are still randomly seeing some outputs on buffer/driver 
high and some low on power up.  We measured between 0.4 and 1.2 volts 
on those lines. Why are 32k pull downs not working for us ?

Regards,
Nick