You didn't say what button you pressed and doesn't look right quite right. For even letters (A,C,E,G,J) it should send the # of pulses followed by a long low. then it will stay high for 200ms and then it will pulse the letter pair (AB=1, CD=2, etc) followed by all high. (see attached image of your bad_state_778 and button A02)

For even letters (B,D,F,H,K) it will send 10 + # pulses followed by 200ms high and then the pulse of the letter pair as above.

In your case, it means the contacts are dirty or broken.

-Techtom