I observed the bug on Firefox/XP. The only reliable way I could reproduce it was to move the mouse slightly so that the letter was briefly selected when I clic

I observed the bug on Firefox/XP. The only reliable way I could reproduce it was to move the mouse slightly so that the letter was briefly selected when I clicked. It might be a case of just moving quickly/selecting. I think it might sometimes happen apart from that, but it's possible that it's the same thing but with deselection happening quickly.