Arduino-Bluetooth HC-05 Android app blueterm connection for chatting
Its totally Normal. You must be doing something wrong. It has happen to my Arduino Code a lot of times. try following:


Try interchanging you Tx and Rx Pin Positions. (This happens all the time).
Try connecting using default Serial and using Pin 1 and Pin 0 as Tx/Rx. (In this case remember to unplug the Tx/Rx Pins while running code.)
Try using just basic Serial.Write() function in beginning.