As the first state of the circuit, when a button is pressed that button button corresponding LED lights up when he left, but did not go out, ta else until you press a button. So was continuously in one LED always stays on.
As the logic in the program only when the buttons are pushed, the data were sent information. I additionally buttons and while holding both pressed when it is not data information, sending buttons while pressing the corresponding LED burning when you left it (I’ve added the command here comes into play.), Extinguishing’ve made.