Shifting Paddle not working properly

The right one of the two shifter paddles seems to have a faulty button. Everytime I shift up, it jumps 2 gears. The button test in the windows control panel seems to be o.k.

Can I replace the button by myself and how?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 1
crwdns2934285:0crwdne2934285:0