Thanks, SpunkySenior. I'll see if it keeps doing it tomorrow or something. I'm having to prove I'm not a robot on other websites, too, so now I don't think it is an answerMug glitch. :)
If it's happening on other sites, then it's something to do with your computer. Try using a different browser and see if it happens on there. I used to use Internet Explorer but switched to Google Chrome. It's a little faster, but I get better results on IE on just one site.