EK-TM4C1294XL: GPIO external interrupt

Hi,

I am using TM4C1294XL .I have configured PP4 GPIO port as an External falling edge triggered interrupt and some other GPIO interrupt as well.

It is working as expected but I am having issue if I give input to some other port pin is it affecting PP4.

PP4 interrupt keep on hitting, if I disable this it is hitting in below ISR

//*****************************************************************************
//
// This is the code that gets called when the processor receives a fault
// interrupt. This simply enters an infinite loop, preserving the system state
// for examination by a debugger.
//
//*****************************************************************************
static void
FaultISR(void)
{
SaveInterruptSource(0x03);
//
// Enter an infinite loop.
//
while(1)
{
}
}

is there any specific reason could you help.

Thanks