AM1808 GPIO Intertupt Question

Hi:

      now i use the GPIO6[9] as a  input and  intertupt port of the remote button.If  the remote button is pressed ,the GPIO6[9] will receive the  singal pusle.

The details as below:

PSCModuleControl(SOC_PSC_1_REGS, HW_PSC_GPIO, PSC_POWERDOMAIN_ALWAYS_ON, PSC_MDCTL_NEXT_ENABLE);

 GPIOBank6Pin9PinMuxSetup();

GPIODirModeSet(SOC_GPIO_0_REGS, 106, GPIO_DIR_INPUT);

GPIOIntTypeSet(SOC_GPIO_0_REGS, 106, GPIO_INT_TYPE_FALLEDGE);

IntAINTCInit();

IntMasterIRQEnable();

IntGlobalEnable();

IntIRQEnable();

IntRegister(SYS_INT_GPIOB6, IrKeyIsr);
IntChannelSet(SYS_INT_GPIOB6, channel);

IntSystemEnable(SYS_INT_GPIOB6);

GPIOBankIntEnable(SOC_GPIO_0_REGS, 6);

According to the remote pulse ,if i press the button ,the GPIO interrupt will toggle 34 times at least,but now it only can toggle 23 times.

Please help me to solve the problem,thanks.