PCF8574A INT Problem

[Pesticida]

Hi,

I have Building a 24 Inputs Alarm Device,all is working fine,but :-) i have just a little Problem
when I have a Voltage on one Pin between the HI and LO PDF Specification the INT is still remaining LOW and is blocking my complete INT.
I use a 10K Resistor on the Interrupt Line,and a Voltage divider like on the Picture.

Thank You for any Help

Regards Pesti.