While accessing a class member variable the value seems to be corrupted

Hi,
I have a class variable, it is initialized in constructor,
but later when a setter member function is called the variable seems to be having a corrupted value.
class WaterFlowMeter: public BaseMeterClass
{

rt_uint8_t m_flowSensEncoder;  --> member variable

public:

WaterFlowMeter();
virtual ~WaterFlowMeter();
void setFlowSensEncoder(void);
rt_uint32_t getFlowSensEncoder(void);
void resetFlowSensEncoder(void);
void flowMeter_Init(void);

static WaterFlowMeter *pWaterFlowCmdHdr;

};

void WaterFlowMeter::setFlowSensEncoder(void)
{

/*
 * Increment the variable when the Rising edge of the
 * flow meter is triggered
 */
rt_kprintf("WFM Encoder = %d\n",m_flowSensEncoder); **--> a wrong value is printed out?????**
m_flowSensEncoder++;

}

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