This seems to be just a support thread with two comments? Was kinda expecting a full bug explanation or something with a bit more substance as to why this is happening beyond 'it's just very odd'.
Frankly I'm amazed that the reply, despite smelling of useless first-line tech support by wasting an entire paragraph to repeat his question pretty much verbatim, managed to actually offer a useful suggestion of testing with an external keyboard.
Yet, it is on top of HN (: Humans are interesting!