I was told by an old service guy about an electric typewriter that used to jam two letters together and just as the lass tried to flick the arms back it jumped a space. Obviously a faulty machine.
He solved the problem by watching the voluminous lady and as she hit two keys at the same time the two arms came out at high speed and lodged in in mid-flight, and leaning forward to flick them back depressed the space bar using an unfamiliar appendage (or two).
There are settings for touch pads and if they are dirty it may affect that.