7 Segment LCD Display issue

In my project i am using 7 segment LCD with arduino (link : http://code.google.com/p/arduino-seven-segment/ ) , in the circuit colon segment made as NC , the issue is the next number “G” segment when gets exited the colon appears , i verified my circuit the colon segment and the G segment closer to gather . i cut the colon pin from my PCB too but still it appears , i connected the NC pin to GND or PWR rail no use . that to it appears when the system in Humid conditions in normal room temperature this issue is not coming , plz advice , i attached the picture of the same .